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Best Boilers in the UK in 2024 (From Top Brands and Budget Alternatives)

The best boilers produce as much heat and hot water as needed while using as little fuel as possible. The best boilers come with a long warranty of over 5 years and last for well over a decade before requiring extensive repairs or a replacement.

Best boilers
Best boilers and boiler brands in the UK

The best boilers in the UK have been consistently produced by the same five boiler brands below.

  • Worcester Bosch
  • Vaillant
  • Baxi
  • Viessmann
  • Alpha

The five aforementioned manufacturers produce boilers with the highest levels of efficiency, durability, and come packed with user-friendly features. These brands’ boilers are generally on the upper end of the price range, but you’re often able to find excellent deals, especially when you get the boilers fitted through an online company like Heatable. Alternatively, there are plenty of other boiler manufacturers on the UK market, who are lesser-known than the five brands above but still offer quality (although often bare-bones) boilers for a low price. Consider the five boiler makers below if you’re on a budget and don’t mind a no-frills boiler that still kicks out plenty of heat, has an A efficiency rating, and comes with a warranty term of over 5 years.

  • Ideal Heating
  • Glow Worm
  • Vokera
  • Intergas
  • Ariston

You can’t go wrong with buying a new boiler from any of the ten brands above, whether you’re looking for a combi, heat-only, or system boiler to work with a Megaflo cylinder. The ideal boiler type for your home depends on your property size, heating and hot water demands, existing heating setup, and whether you want to integrate an underfloor heating system.

All of the best boilers in the UK are designed to work with mains gas, which is the most common boiler fuel type. However, the majority of gas boilers are capable of operating on LPG, which may be necessary for static caravans and remote properties off the gas grid. Oil is an LPG alternative for homes that do not have access to mains gas, and brands such as Warmflow, Grant, and Worcester produce some of the best oil boilers on the UK market.

Electricity is much cleaner, but far more expensive boiler fuel option than LPG or oil. Electric boilers are widely available in the UK, and work much like their gas-fired counterparts. The best electric boilers are equipped with energy-savings features that allow users to offset the high boiler running costs incurred due to high electrical unit rates.

You’re able to find the best boiler deals by soliciting as many quotes as possible from local and online boiler fitters. Heatable offer a quick and straightforward way of getting fixed-rate quotes on the best boilers in the UK, which you’re able to use as a benchmark while comparing estimates from other boiler fitters.

Below is a guide to the UK’s best boilers of 2024. Our guide below lists the top-performing boiler models from the nation’s best boiler brands, offers budget boiler alternatives, and helps narrow down your search to the most suitable models for your property configuration, heating, and hot water needs.

What are the best boiler brands in 2024?

Below are the five best boiler brands on the UK market in 2024.

  1. Worcester Bosch
  2. Vaillant
  3. Baxi
  4. Viessmann
  5. Alpha Innovation

The aforementioned brands’ models are the most efficient, reliable, and user-friendly boilers available in the nation. These five brands offer a collective wealth of boiler models that suit various heating preferences, property configurations, and budgets. Below is a thorough guide to the UK’s top boiler brands and the best boilers of 2024.

1. Worcester Bosch

Worcester boilers
Worcester Boilers

Worcester Bosch manufacture some of the UK’s best boilers and are a household name in the country. What sets Worcester Bosch boilers apart from the competing boiler brands is how their products come with a guarantee rather than a warranty.  What appears to be a choice in semantics actually carries a great difference and shows Worcester’s unwavering confidence in its products. A warranty comes with a premium payment and covers certain parts of the boiler. A guarantee is a free promise from the manufacturer to repair or replace the boiler free of charge. However, there is still an annual service requirement to ensure the boiler is maintained and in good working order.

Worcester Bosch boilers are one of the higher-end boilers in terms of price. However, their quality, reliability, and efficiency offset the above-average upfront costs in the long term.  The best Worcester boilers embody the company’s reputation for high performance, energy efficiency, and reliability.

What is the best Worcester boiler?

The best Worcester boiler is the Worcester Greenstar 4000. The Greenstar 4000 is not the largest boiler offered by Worcester. However, it is the perfect size for most family homes. Worcester Bosch offers the Greenstar 4000 in both system and combi models, which captures a large portion of the UK market and means people electing for a Greenstar do not need to pay the extra costs commonly associated with changing boiler types.

There are five key plus points to choosing the Worcester Greenstar 4000. Firstly, the Greenstar 4000 is highly reliable. Worcester boilers are not the cheapest, but they are known for their quality. The Greenstar 4000 is capable of handling the heating and hot water demands of modern family life for over 10 years without significant wear and tear. Secondly, the Greenstar 4000 boiler is highly efficient. Its average energy efficiency rating of 94% means that users are able to save money every month they own a Greenstar 4000. Thirdly, Worcester prides itself on the quality of its boilers and offers the Greenstar 4000 30kW Combi with a 7-year guarantee as standard, which is extendable by an additional three years when you use a Worcester-approved installer. Fourthly, the Greenstar 4000 is a compact boiler that does not take up unnecessary space in your home. At just 310mm deep, the Greenstar 4000 is perfect to fit inside a kitchen cupboard or a similar hidden location around the home. Finally, the Greenstar 4000 offers remote connections to the Bosch EasyControl system. EasyControl means you are able to connect to and control your boiler via a smartphone or tablet, providing you ultimate control over your heating whether you’re at home or away.

The primary drawback to the Greenstar 4000 is that it’s not the most budget-friendly boiler on the market. Buying a new Greenstar 4000 is going to set you back around £1,500, whilst the fitted costs are typically over £2,500. You’re able to get your own Worcester Greenstar 4000 price with installation from Heatable by filling in this anonymous property questionnaire.

Worcester Bosch Greenstar 4000

What is the Worcester Bosch boiler range?

The Worcester Bosch boiler range is a selection of boilers that comprise the 12 models listed below.

  • Worcester Greenstar 4000: The Worcester Greenstar 4000 is the leading boiler in the Worcester range. The Greenstar 4000 is perfectly suited to mid-sized family homes with moderate water demand and is available in both combi and system models. The combi models offer 28kW and 30kW outputs, while the system boiler has five models ranging from 12kW to 24kW.
  • Worcester Greenstar 2000: The Worcester Greenstar 2000 is a smaller and more budget-friendly boiler ideal for small to medium-sized family homes. The Greenstar 2000 is available in two models with 25kW and 30kW outputs and reaches over 97% efficiency when operated in the condensing regime.
  • Worcester Bosch Greenstar 8000: The Worcester Bosch Greenstar 8000 is a large boiler available in a range of models that offer outputs of up to 50kW. The Greenstar 8000 is the perfect boiler for medium to large detached family homes with a heavy water need. The Greenstar 8000 50kW boiler manages to reach 98% useful efficiency when operating on a low heat regime. The Worcester Bosch 8000 comes with an extended 12-year guarantee.
  • Greenstar CDi Compact: The Greenstar CDi Compact is a small, economical boiler well suited to medium-sized properties with up to two bathrooms. The CDi Compact comes with frost protection and is rated A* for efficiency. The CDi Compact combi boiler is available in three models with a 28kW, 32kW, and 36kW output.
  • Greenstar CDi Highflow: The Greenstar CDi Highflow is a larger boiler often installed inside a lower kitchen unit. The CDi Highflow comes in two different models that, despite their size, still achieve an economical and efficient 97% rating. With flow rates of up to 25 litres a minute, the Highflow is ideal for large homes or households with high water demand.
  • Greenstar CDi FS: The Greenstar CDi FS is a larger regular boiler that is well suited to large properties and homes that have an existing floor-standing boiler that needs replacing. The CDi FS is a future-proof boiler, ready to operate with a 20% hydrogen mix and is able to connect to Greenskies solar panels. The CDi is available in two models that provide a 30kW and 42kW output.
  • Greenstar Si Compact: The Greenstar Si Compact is the ideal boiler for a flat or small home with a single bathroom. The Si Compact combi boiler is available in 25kW and 30kW models with a moderate flow rate of up to 10 litres a minute. That is a fast enough flow to fill a kitchen sink with a usable amount of water in under a minute. The Si Compact also uses a low-energy pump, which means you save on your electricity usage without sacrificing boiler efficiency.
  • Greenstar i: The Greenstar i comes in 27kW and 30kW models, both of which are possible to connect via the Worcester Bosch Easy Control system and solar panels. The Greenstar i is a premium system boiler that is both efficient at 97% useful efficiency and economical. The Greenstar i is an appropriate boiler for a small to medium-sized property with no more than two bathrooms and moderate hot water demand.
  • Greenstar Ri: The Greenstar Ri is a compact boiler that is easily wall-mounted or hidden inside a spare kitchen cupboard, so it’s a great choice of combi boiler for a flat or a smaller property. Depending on your needs, the Greenstar Ri combi is available in 6 models, offering an output range between 9kW to 24kW and a useful efficiency rating of up to 98%.
  • Greenstar Heatslave II: The Greenstar Heatslave II is an oil combi boiler that is powerful enough to fill a kitchen sink in under thirty seconds. The Heatslave II comes with an 18kW output and a 97% useful efficiency rating, making it a great choice for any sized property. Unlike most other Worcester Bosch boilers, the Heatslave II works with a variety of heat sources, including solar panels and even wood burners, a capability that helps drive heightened efficiency and reduced operating costs.
  • Greenstar Danesmoor External: The Greenstar Danesmoor External is an external boiler unit that frees up space inside your property without sacrificing the quality or reliability of your heating and hot water. The Danesmoor External is a quality condensing boiler with a useful efficiency of 97%. Worcester Bosch manufactures three Danesmoor External models, each with an 18kW, 25kW and 32kW output, making them the ideal choice for small or medium-sized homes with up to two bathrooms.
  • Greenstar Danesmoor Utility: The Greenstar Danesmoor Utility is a large system boiler with built-in hot water storage, replacing the need for an additional tank or pump. With concealed controls, the Danesmoor utility doesn’t look out of place in the home and drives cost savings due to its EasyControl compatibility and solar panel connections. Worcester Bosch manufactures the Danesmoor Utility in three models with 18kW, 25kW and 30kW outputs, respectively.

2. Vaillant

Vaillant boilers
Vaillant Boilers

Vaillant are a boiler manufacturer with a reputation for quality, efficient, and environmentally friendly boilers. Vaillant’s ecoTEC range is their most popular product line, and the ecoTEC exclusive with Green iQ combi boiler was the winner of the 2018 Housebuilder Products Awards. Vaillant boilers come with seven to ten-year guarantees, which shows Vaillant’s faith in the quality of their products. Vaillant’s best boilers are not cheap but offer proven reliability, high performance, and a range of straightforward controls.

What is the best Vaillant boiler?

The best Vaillant boiler is the ecoTEC Plus combi. The ecoTEC plus combi is Vaillant’s best offering for three reasons. Firstly, the ecoTEC Plus is able to automatically reduce its output to just 16% of its maximum capacity. This ability to reduce its power allows the boiler to consume less gas while continuing to operate, which is more energy-efficient than simply turning off and firing back up to maintain the required temperature. Secondly, the ecoTEC Plus operates at such a low noise level that it’s received the Quiet Mark, which is the internationally recognized award given to the quietest of appliances. Finally, the ecoTEC plus combi has an impressive flow rate of 15.9 litres per minute, which is quite high for a combi boiler (for comparison, the Greenstar 4000 has a flow rate of 10.8l/minute). The boiler’s high flow rate means that it’s able to provide acceptable pressure at the taps and showers even if more than one fixture is running at the same time.

What is the Vaillant boiler range?

The following are the six models that make up the Vaillant boiler range in the UK.

  • Vaillant ecoTEC Plus: Vaillant’s ecoTEC Plus lineup is available as combi, system, and regular boiler types. The ecoTEC Plus range is well-suited for a range of home sizes, as its models range in output between 10kW and 64kW. The range boasts an ErP efficiency of A/A+ for heating and hot water, with seasonal efficiency between 90% and 94% depending on the boiler type and output. ecoTEC Plus is not a cheap boiler range, with an average boiler-only price of £1,400.
  • Vaillant ecoTEC exclusive: The ecoTEC exclusive is Vaillant’s premium lineup, which includes combination and system boilers ranging between 27kW (system boiler) and 43kW (combi). ecoTEC exclusive boilers have a precision heat function that adapts the heating regime and minimises waste. Despite this feature, the ecoTEC exclusive has a lower energy efficiency of 89.6%. The boiler-only price of an ecoTEC exclusive boiler hovers around £1,600.
  • Vaillant ecoTEC pro: The ecoTEC pro is a combi boiler designed for larger homes with up to 3 bedrooms and 1 bathroom. ecoTECpro is available in 24-30kW capacities and uses precision heating to tailor the output as needed. The boiler is A-rated but only has an efficiency of 89% on SEDBUK. The ecoTECpro costs roughly £1,100 without installation.
  • Vaillant ecoFIT pure: The ecoFIT pure is a boiler that comes in combi, system, and regular varieties and has compact dimensions, so you’re able to tuck it away into a kitchen cupboard. The ecoFIT is powerful despite its small size and is able to serve properties of the same size as the ecoTEC Plus.  The ecoFIT pure boiler-only costs are roughly £1,000.

Use Heatable’s online boiler quotation tool to get a range of fixed-priced quotes on Vaillant boilers and other models that are suitable for your home.

3. Baxi

Baxi boilers
Baxi Boilers

Baxi are a long-serving British boiler manufacturer that have been in operation since 1866. Baxi’s long history of serving heating products to the British public has earned them a reputation for producing premium but budget-friendly boilers. Baxi are a notably less expensive boiler brand, but they are a quality boiler maker with a diverse range of boiler types and models that suit various property types and heating needs. The best Baxi boilers rival the efficiency, durability, and user-friendly features of Worcester and Vaillant, but at a much lower cost.

Which is the best Baxi boiler?

The Baxi 800 is the best Baxi boiler in 2024. The 800 tops the Baxi boiler range for three main reasons. Firstly, the Baxi 800 is a high-performing boiler, with up to 36kW of heating power for domestic hot water at a maximum flow rate of 15 litres per minute. This high hot water performance allows the Baxi 800 to handle increased simultaneous hot water demand during peak usage times without reducing the tap water to a drip (as long as mains pressure is sufficient). Secondly, the Baxi 800 has compact dimensions that allow it to fit into a standard kitchen cupboard. This ability to tuck away into a cupboard means that Baxi 800 helps you preserve valuable space in your home. Thirdly, the Baxi 800 comes with convenient features that make it easy for users to operate the boiler without much technical knowledge. For example, the Baxi 800 has an EasyFill feature that allows users to quickly repressurise the heating system without calling an engineer. Likewise, the heated condensate trap means that the condensate pipe does not freeze on the coldest of winter days, thus sparing you from thawing the pipe out in the cold or calling an engineer. Finally, the Baxi 800 has an impressive, 10-year warranty as long as you fit the boiler along with the Adey Micro 2 magnetic filter to prevent sludge buildup in the internal components.

What is the Baxi boiler range?

Below is a list of the six models that comprise the Baxi boiler range.

  • Baxi 800: The Baxi 800 is the company’s premium model that’s available as a combi, system, and heat-only boiler. The 800 comes with a 10-year warranty as standard for all boiler types, and costs between £1,000-£1,200 before installation.
  • Baxi Platinum: The Baxi Platinum is a powerful, A-rated combi and system boiler that’s easily mounted anywhere thanks to its multi-fit flue kit. The Platinum comes in a variety of heating outputs but is designed for properties with high heating and hot water demand. Baxi Platinum has a 10-year standard warranty and costs around £1,200 (boiler-only).
  • Baxi 600: Baxi 600 is Baxi’s mid-range model that’s available as a combi, system, and heat-only boiler. The Baxi 600 is 93% energy-efficient, fits the dimensions of a kitchen cupboard, and works with either natural gas or LPG without a conversion kit. You’re able to get the Baxi 600 for £800-£1,000 (boiler-only) with a standard warranty length of 7 years.
  • Baxi 400: The Baxi 400 is an A-rated compact boiler that comes in the combi and heat-only variants, with output ranging from 12kW to 30kW. The 400 comes with a 5-year warranty and costs £700-£900, excluding installation.
  • Baxi 200: The Baxi 200 is a budget, no-frills combi boiler made for smaller homes and owners who do not need too many features. The Baxi 200 comes with a 2-year warranty and costs roughly £700 without installation.
  • Baxi Duo-Tec: Baxi Duo-Tec is a powerful combi boiler with a high, 16.4l/minute flow rate and a heating capacity of up to 40kW. This level of heating power means that the Duo-Tec is capable of serving large homes with high hot water consumption. The Duo-Tec costs around £900 before installation and comes with a 7-year standard warranty.
  • Baxi Megaflo system boiler: This Baxi system boiler is designed to work with the Megaflo hot water cylinders (manufactured by Heatrae Sadia, which are part of Baxi Heating). The Baxi Megaflo system boiler is ideal for homes that consume lots of hot water at the same time. You’re able to purchase the Baxi Megaflo for around £1,000, excluding installation, with a 7-year warranty as standard.

4. Viessmann

Viessmann boilers
Viessmann Boilers

Viessmann is a German-owned company and the largest manufacturer of boilers and heating equipment in Europe. Viessmann boilers are regarded as some of the best on the UK market and are renowned for their in-house built stainless steel heat exchangers, which are responsible for the boilers’ high efficiency rating and well-known durability. Viessmann boilers are packed with innovative features that extend their long-term heating efficiency and prolong their lifespan. All of the Viessmann boilers are futureproof and ready to run on the proposed 20% hydrogen blend ahead of the 2025 deadline for fully hydrogen-fueled boilers. The different Which? polls and rankings invariably have at least one model in the various Viessmann boilers in their best of categories. The best Viessmann boilers are more budget-friendly than their Worcester and Vaillant peers despite their sterling reputation for durability and long-term high performance.

Which is the best Viessmann boiler?

The Viessmann Vitodens 50-W is the best Viessmann boiler in 2024. The Vitodens 50-W is the best boiler in the Viessmann lineup for three reasons. Firstly, the Vitodens 050-W comes with innovative features that extend its useful service life and maintain high energy-efficiency and performance. For example, the stainless steel heat exchanger is designed to withstand the strain associated with extreme heat, temperatures, and moisture without developing flaws for a decade. Meanwhile, the burner is designed to maintain its fuel efficiency and heating output even as the quality of the natural gas changes. Secondly, the Vitodens 050-W has a small footprint, so you’re able to mount it in a cupboard or between cupboards for a tidy fit. Finally, the Vitodens 050-W is budget-friendly, with purchase costs of around £1,000-£1,400 and fitted costs of £2,000-£2,400.

What is the Viessmann boiler range?

Below are the five models comprising the Viessmann boiler range.

  • Viessmann Vitodens 050: The Vitodens 050-W is Viessmann’s smallest model that’s available as a combi or a system boiler. The 050-W is particularly well-suited for smaller homes and modest hot water demand. The model is well-known for its reliable components and boasts an energy efficiency of 92%. You’re able to get the Vitodens 050-W for £1,100-£1,400 before installation, including a 7-year standard warranty.
  • Viessmann Vitodens 100: The Vitodens 100-W is similar to the 050-W in every regard, except energy efficiency. The 100-W is 94% efficient, so 94p of every pound you spend on heat converts into heat. In contrast, the 050-W has an energy efficiency of 92%. The modest increase in energy efficiency and the consequent fuel savings drive up the price of the 100-W, which costs around £1,400 without installation.
  • Viessmann Vitodens 200-W: The Vitodens 200-W is Viessmann’s top-of-the-range boiler, with an energy efficiency of 98% possible thanks to its 1:17 modulation range. The Vitodens 200-W comes as a combi and system boiler, and both variants are capable of powering larger homes with several bedrooms. The 200-W costs £1,600-£1,800 before installation and comes with a 7-year warranty as standard.
  • Viessmann Vitodens 111-W: The Vitodens 111-W is a storage combi boiler, which functions like any other combi but includes an integral 46-litre hot water tank that boosts its heated water supply. The 111-W is suitable for homes with more than one bathroom, where dwellers are likely to run more than one tap concurrently. The Vitodens 111-W boiler costs £1,900-£2,100 before installation and comes with a 7-year standard warranty.
  • Viessmann Vitodens 222-F: the Vitodens 222-F is a large storage combi that functions just like its smaller 111-W version, but has a 100-litre integral hot water tank. The added hot water storage capability comes at a premium, as the 222-F storage combi costs roughly £1,000 more than the 111-W (before installation). The 222-F has a standard warranty of 5 years when fitted by a Viessmann-accredited installer.

Find out which Viessmann boiler is most suitable for your home using Heatable’s online boiler selection tool.

5. Alpha Heating Innovation

Alpha boilers
Alpha Boilers

Alpha Heating Innovation are new on the UK heating market, but their lineup offers some of the best boiler options available. Alpha boilers are manufactured with extremely durable components, such as the stainless steel heat exchanger and top-tier Grundfos pump. Their warranty lengths mirror Viessmann’s, which is a credible indicator of reliability. Alpha boilers are A-rated, with efficiencies of around 93% for most models. Alpha boilers are quite budget-friendly despite their significant advantages, such as quality components and high energy efficiency.

Which is the best Alpha boiler?

The Alpha E-Tec Plus is the best Alpha boiler in 2024 for three reasons. Firstly, the Alpha E-Tec has an impressively low price point — you’re able to get the E-Tec for around £1,800 with installation included. This price point is £500-£1,000 lower than that of a comparable Worcester or Viessmann boiler. Secondly, the Alpha E-Tec Plus has a 93% seasonal efficiency, which is quite impressive given the low purchase price. Thirdly, Alpha E-Tec Plus comes with a generous 10-year warranty, which you’re able to extend to 13 years if you fit it with Alpha’s Premier Pack, which includes a magnetic filter.

What is the Alpha boiler range?

Below are the five models that make up the Alpha boiler range.

  • Alpha E-Tec Plus: The E-Tec Plus is Alpha’s best and most popular combi boiler. The E-Tec Plus comes with a durable stainless steel heat exchanger, a 10-year standard warranty, and boasts an energy efficiency of 93%. The E-Tec costs roughly £1,000 before installation.
  • Alpha E-Tec NX/S: The E-Tec NX is a newer E-Tec range comprising combis (NX) and system boilers (NXS). The NX range has a small footprint, so it’s a suitable boiler for homes where space is limited. E-Tec NX and NXS boilers integrate with weather compensation functions and work with a range of control options thanks to their compatibility with the Open Therm protocol. The NX/S boilers come with a standard 7-year warranty and cost roughly £1,100, excluding installation.
  • Alpha E-Tec Regular: The E-Tec Regular is the heat-only version of the E-Tec Plus, with which it shares its features, heating performance, and energy efficiency. The Regular comes with a 7-year standard warranty and costs approximately £1,100 before installation.
  • Alpha Evoke NX: Alpha Evoke is a more economical combi alternative to the E-Tec Plus, although it’s equally efficient and comes with the same durable components. You’re able to get the Evoke NX for under £1,000 before installation, including a 7-year standard warranty.
  • Protec Plus System Boiler: The Protec Plus system boiler is able to operate with sealed and open systems. The Protec Plus boiler is designed specifically for large homes with multiple bedrooms and high hot water consumption. The boiler comes with a 5-year standard warranty and costs between £1,300 and £1,400 before installation.

See if an Alpha boiler is suitable for your home using Heatable’s online boiler selection tool.

Alternative boiler brands

The following five alternative brands produce quality boilers but are not considered to be top-tier like the manufacturers listed in the section above.

  • Ideal Heating
  • Glow Worm
  • Vokera
  • Intergas
  • Ariston

The five aforementioned brands offer a good starting point for choosing an entry-level boiler. All boilers from these manufacturers are condensing and A-rated for energy efficiency, and are capable of delivering required levels of heat and hot water. They may lack advanced features that are taken for granted with a Worcester or Viessmann, but the lower price point makes them a suitable alternative for users who are on a tight budget.

Below is an in-depth look at the UK’s more budget-friendly boiler brands along with their boiler lineups.

Ideal Heating

Ideal Boilers
Ideal Boilers

Ideal are a popular UK boiler brand that are known as the budget alternative to the likes of Worcester, Vaillant, and Viessmann. You’re able to find decent boilers in the Ideal lineup, but without paying as much as you would for a Worcester Bosch. Ideal’s comparatively low price point makes them a direct competitor to Baxi, who likewise manufacture affordable premium boilers. Ideal boilers are ranked slightly below Baxi’s simply because they come with slightly shorter warranties out of the box. The best Ideal boilers offer a balance between low costs and key boiler metrics, such as fuel efficiency, warranty length, and convenient features.

What is the Ideal boiler range?

Below are the five key models in the Ideal boiler range.

  • Ideal Logic Max
  • Ideal Logic+
  • Ideal Vogue Max
  • Ideal Vogue Gen 2
  • Ideal Mexico HE

Glow Worm

Glow Worm boilers
Glow-Worm Boilers

Glow Worm are the budget arm of Vaillant, and their boilers are widely considered to be second-tier. However, Glow Worm is a suitable go-to option for a quality entry-level boiler, as long as you choose the right model. For example, the Ultimate3 model still boasts a 93% energy efficiency and comes with a 10-year manufacturer warranty as standard, despite a relatively low price range of £1,500-£1,800 with installation. Other, less expensive models come with shorter warranties that range between 3 and 7 years and have fewer user-friendly features, although all are ErP A-rated.

What is the Glow Worm boiler range?

Below are the four models in the Glow Worm range.

  • Glow Worm Ultimate
  • Glow Worm Energy
  • Glow Worm Compact
  • Glow Worm Easicom


Vokera boilers
Vokera Boilers

Vokera boilers are known for their bare-bones, decently priced, yet reliable boilers among installers and users alike. Vokera boilers may be a good fit for your home if you’re less concerned with advanced features and more interested in a well-priced boiler that’s got a high energy efficiency rating and a long warranty. The best Vokera boilers, such as the Unica Max, meet the aforementioned criteria, with a 94% efficiency, a 10-year warranty, and a purchase price below £1,000.

What is the Vokera boiler range?

The Vokera boiler range includes the five boiler models below.

  • Vokera Unica MAX C
  • Vokera Vision Plus C
  • Vokera Vibe MAX C
  • Vokera Compact A
  • Vokera Mynute VHE


Intergas boilers
Intergas Boilers

Interagas are a lesser-known boiler brand that nonetheless produce quality boilers at a mid-range price. Intergas boilers come with uniquely designed components that maximise their efficiency, such as the aluminium-copper bi-thermic heat exchanger that allows a boiler to operate in the energy-saving condensing mode when heating water. These innovative internal components are highly durable, and Intergas offer a 10-year warranty on their heat exchangers — much like Viessmann do. Intergas warranties go as high as 10 years for the more expensive Eco RF and Xclusive models, although these boilers’ purchase costs are still around £1,000 before installation. The cheaper Intergas models (such as the Rapid) cost closer to £600 before installation but come with shorter, 3-5 year warranty terms.

What is the Intergas boiler range?

The Intergas boiler range includes the seven boiler models listed below.

  • Intergas Eco RF
  • Intergas Xclusive
  • Intergas HRE
  • Intergas Rapid
  • Intergas Rapid Plus
  • Intergas Xtreme
  • Intergas HRE OV/SB


Ariston boilers
Ariston Boilers

Ariston boilers lack the popularity of their Worcester, Vaillant, or Viessmann rivals, but these boilers come with impressive energy-efficiency ratings of 90-94% and warranties that range on average between 8-12 years. Ariston boilers pack some convenient features, such as the auto function, which automatically selects the best operating regime for the boiler. The price of Ariston boilers ranges between £700 and £2,000, excluding installation.

What is the Ariston boiler range?

The following is a list of boilers that comprise the Ariston boiler range.

  • Ariston Atlas One Net
  • Ariston Genus One
  • Ariston Class One
  • Ariston Genus Premium EVO HP

What is the best combi boiler?

The best combi boiler in the UK in 2024 is the Worcester Bosch Greenstar 4000. There are four key points that set Greenstar combi boiler ahead of the competition. Firstly, the Greenstar 4000 is an efficient boiler, with a useful efficiency of 98% when operating in condensing mode. This efficiency level is above what many other comparable boilers offer, even if they still are all rated ‘A’ under the ErP. Secondly, the model of the Greenstar 4000 range comes with a potential 10-year guarantee. The guarantee is a free service offered by Worcester Bosch that supplants a warranty and ensures well-maintained boilers that experience problems are repaired or replaced free of charge. Thirdly, the Greenstar 4000 range all come with the Worcester Bosch ‘Quick tap’ system. Quick Tap is a water-saving system that minimizes water waste and unnecessary costs on your bills without sacrificing the performance or efficiency of your boiler. Finally, the Greenstar 4000 model sits at an adequate price point for most families and is easily subjected to various finance arrangements. Fill in Heatable’s anonymous, 90-second online questionnaire to find out how much a Greenstar 4000 combi would cost to install in your home.

Which is the best price combi boiler?

The Alpha E-Tec Plus is the best price combi boiler in the UK. The E-Tec Plus is available in 28kW, 33kW and 38kW models and costs less than £1,000 excluding installation. Given the range of boiler sizes, the E-Tec Plus is perfect for use in small, medium or even large properties with varied hot water and heating demands. The Alpha E-Tec Plus combi boiler comes with a 10-year standard warranty with purchasable options that increase this to 13 years. Alpha boilers are budget-friendly but highly efficient thanks to their thermoplastic-moulded stainless steel heat exchangers.

Which is the best value combi boiler?

The best value combi boiler is the Viessmann Vitodens 050-W. The Vitodens 050-W offers the best value for money among the combis available in the UK for three reasons. Firstly, the Vitodens 050-W packs Viessmann’s innovative technologies, such as the Inox Radial stainless steel heat exchanger and the MatriX burner. These components are designed to last a long time without requiring repairs or losing operational efficiency due to wear and tear, so the 050-W preserves its durability and performance throughout its lifetime. Secondly, the Vitodens 050-W is compact, so you’re able to tuck it away into a kitchen cupboard and conserve space at home. Finally, the Vitodens 050-W costs less than equivalent models from Worcester Bosch or Vaillant. The boiler-only price of a Vitodens 050-W is around £1,000-£1,400, which becomes £2,000-£2,400 with installation. This price range represents one of the best boiler deals on the UK market, considering you’re getting a premium, compact boiler with a stellar reputation for its efficiency and durability.

Get your fixed-price, no-obligation quote for a Viessmann Vitodens 050-W combi at Heatable.

Which is the best heat-only boiler?

The best heat-only boiler is the Worcester Bosch Greenstar Ri. The Greenstar Ri is the top heat-only boiler pick for two reasons. Firstly, the Greenstar Ri is highly energy-efficient, with an efficiency of 92% when run in condensing mode. This level of efficiency translates into sizable savings on the gas bill, as 92p of every pound spent is converted to heat. Secondly, the Greenstar Ri has compact dimensions, so it easily fits into standard kitchen cupboards. This compactness is a significant advantage for the Greenstar Ri, since heat-only boilers already take up lots of space with their hot and cold water storage tanks. Thirdly, the Greenstar Ri is hydrogen-ready, so it’s able to run on a 20% hydrogen blend when (and if) the UK gas grid starts delivering a hydrogen-natural gas mix. Thirdly, the Greenstar Ri is moderately priced: you should be able to get one for under £3,000, including installation.

Which is the best system boiler?

The best system boiler is the Worcester Greenstar 4000. There are three main reasons why the Greenstar 4000 is the best option for a new system boiler. Firstly, the Greenstar 4000 system boiler is very easy to operate thanks to its convenient features. The boiler integrates with smartphone controls and wireless thermostats, takes the guesswork out of repressurisation with intelligent filling, and prevents the condensate pipe from freezing over with the CondenseSure Siphon feature. Secondly, the Worcester Greenstar 4000 system boiler boasts an efficiency of 94%, which translates into 94p converted to heat for every pound spent on the gas bill. Thirdly, the Greenstar 4000 system boiler is well-priced at £1,400 for the boiler-only and ~£2,400 fitted. The boiler’s price point is particularly reasonable given its advanced, user-friendly features and high-efficiency levels.

Get a fixed-price quote on a new Worcester Greenstar 4000 system boiler from Heatable.

Which is the best boiler for the Megaflo system?

The best boiler for the Megaflo system (often misspelt as “Megaflow”) is any system or regular boiler that’s suitable for your property. Megflo systems comprise an unvented domestic hot water cylinder that’s heated by an internal coil through which a system or regular boiler circulates hot water. The coil then transfers the heat to the potable water inside the Megaflo cylinder. All system and regular boilers are designed to work with hot water cyclinders such as the Megaflo system, so which boiler model you choose depends on your heating needs.

What is the best type of boiler?

The best type of boiler depends on your existing boiler setup, heating and hot water requirements, and budget. Below is a summary of the primary boiler types and their suitability.

  • Combi boilers: Combi (short for “combination”) boilers are designed for small homes and families with low hot water demand. Combis are generally budget-friendly, easy to use, and take up little space since they do not need any hot or cold water storage tanks. However, combi boilers are only capable of heating as much water as the mains pressure allows at any given moment, so they struggle to keep up with demand if there are multiple taps or showers on simultaneously.
  • Storage combi boilers: Storage combi boilers are appropriate for households that require higher hot water volumes than a standard combi is capable of producing, but lack the space to accommodate a separate hot water cylinder. Storage combis operate just like standard combis, by heating water directly from the mains. However, this type of combination boiler likewise stores hot water in an integral cylinder. This ability to maintain a hot water reservoir allows storage combis to supply higher volumes of heated water than traditional combination boilers.
  • System boilers: System boilers are best suited to large, thirsty households that do not have an existing conventional heating setup (i.e. without cold water storage tanks up in the loft). System boilers work in conjunction with a separate hot water cylinder, in which they heat potable water via an internal coil. System boilers are able to supply higher quantities of heated tap water than combis but have a larger footprint than combination boilers because of their reliance on a storage cylinder.
  • Regular boilers: Regular boilers are most suitable for homes that have an existing conventional boiler setup, with cold water storage tanks in the loft and a hot water cylinder. Regular boilers operate just like system boilers, except they require tanks to store cold water — one tank for domestic hot water, the other for the central heating system. Regular boilers were the most common residential boiler type for much of the 20th century, and many homes’ heating systems are still configured to work with a regular boiler. Replacing an existing old regular boiler with a combi or system model may be a wise choice if you’re trying to free up space at home and get rid of the cold water tanks. However, such a replacement costs more than a simple swap for a new regular boiler.

Which is the best boiler for an underfloor system?

A combination boiler is the best boiler for an underfloor system because combis are capable of supplying heating water at the low temperatures needed for underfloor heat without compromising the safety of tap water. The major difference between radiators and underfloor heating is that the latter works with lower water temperatures, typically 50°C flow and 40°C return. Setting the flow temperature below 65°C on a heat-only or system boiler means that the internal coil inside the DHW cylinder is unable to heat the home’s potable water supply above 60°C. Keeping the DHW at or above 60°C is mandatory to prevent the risk of legionella bacteria developing. To summarise, a system or regular boiler is unable to safely provide the low flow temperatures needed for an underfloor heating system. In contrast, a combination boiler has separate heat exchangers and temperature settings for central heating and domestic hot water. This separation of the two heating functions means that a combi is capable of supplying flow water for underfloor heating at a temperature of 50°C, and this low temperature has no effect on the drinking water the combi heats.

That said, there is no “ideal” combi boiler for an underfloor heating system. Any combi boiler you choose for your home — such as our Greenstar 4000 recommendation — works just as well with underfloor heating as it does with radiators. Just be aware that you need to install a two-port valve if you wish the combi to circulate hot water through your rads and the underfloor heating pipework.

Which is the best gas boiler for home heating?

What the best gas boiler is for home heating depends on what type of boiler is most fitting for your property and central heating system. Below are the best models for a gas combi, storage combi, system, and heat-only boilers in 2024.

  • Best gas combi boiler for home heating: Worcester Bosch Greenstar 4000 is the best overall gas combi for heating a home. The Greenstar 4000 comes with user-friendly, convenient features that ensure smooth controls and operation, whilst heating with an energy-efficiency of 98%. However, the best value gas combi for home heating is the Viessmann Vitodens 050-W, which is highly efficient and incredibly durable but comes at a lower price point than the Greenstar 4000.
  • Best gas system boiler for home heating: Worcester Greenstar 4000 is the best system boiler for heating a home. The Greenstar 4000 system boiler model has the same innovative technologies that ensure efficient, seamless operation as its combi counterpart. The price range of the Greenstar 4000 system boiler is likewise reasonable considering how efficient and user-friendly it is.
  • Best gas heat-only boiler: Worcester Bosch Greenstar Ri is the best heat-only boiler to power a home heating system. The Greenstar Ri is as efficient as the rest of the Worcester boiler range, comes with intuitive controls, and is hydrogen-ready. What sets this heat-only boiler apart from its peers is that it’s compact, meaning that it can be installed inside a kitchen cupboard — a major plus considering how much space heat-only boiler setups generally take up. The Greenstar Ri is moderately priced compared to equivalent models from competing brands despite its compact size and 92% heating efficiency.

Heatable’s online boiler selection tool helps you establish which gas or LPG boiler is best for heating your home. Fill in this anonymous questionnaire to get an instant list of recommended boiler models, along with fixed-price quotes.

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What are A-rated gas boilers?

A-rated gas boilers are the most fuel-efficient boilers on the Energy-related Products Directive (ErP) and the SEDBUK rating system ErP replaced, with an efficiency of 90% or more. The ErP scale has ratings A++ through G, and each rating corresponds to the following efficiency percentages for boilers.

  • A/+A/++A-rated boiler: >90%
  • B-rated boiler: 86%-90%
  • C-rated boiler: 82%-86%
  • D-rated boiler: 78%-82%
  • E-rated boiler: 74%-78%
  • F-rated boiler: 70%-74%
  • G-rated boiler: <70%

An A-rated gas boiler’s efficiency of 90% or more means that it converts at least 90% of the fuel combusted into usable heat. In pounds and pence, this efficiency rating means that an A-rated boiler converts 90p or more into heat for every pound you spend on gas.

All modern condensing boilers are A-rated, and you’re not able to purchase and install one that isn’t. That said, there are differences of a few percentage points between the many A-rated boiler models on the market. For example, modern Worcester boilers are all A-rated, but the newer Greenstar 8000 models have a 98% efficiency, whilst the older Greenstar Si models are 94% efficient. The difference may not seem like much, but it means that the older Greenstar wastes 4p more for every pound you spend on gas than its newer 8000 counterpart.

Which is the best electric boiler?

The best electric boiler in 2024 is the Comet Combi Boiler from the Electric Heating Company. The Comet Combi Boiler is the best electric boiler on the market for three reasons. Firstly, the Comet Combi is 100% energy efficient, meaning that every watt of energy consumed is converted to useful heat. Secondly, the Comet Combi has a durable, stainless steel heat exchanger. Heat exchangers are constantly subjected to extreme heat, high pressure, and moisture, and a corrosion-resistant, strong material such as stainless steel allows these boiler parts to withstand all the strain without developing early flaws. Thirdly, the Comet Combi boiler comes with a magnetic filter, which protects the boiler’s internal components from sludge accumulation. Sludge buildup is one of the most common reasons for boiler blockages and flaws with expensive components, such as the heat exchanger.

The Comet Combi Boiler has a maximum heating output of 14.4kW, so it’s suitable for a small home with up to 10 radiators and one bathroom. This electric boiler costs roughly £2,700 to purchase, and £3,200-£3,700 with installation. The price of the Comet Combi includes a 2-year standard warranty, plus a separate 10-year warranty on the hot water cylinder.

Which is the best oil boiler?

What the best oil boiler depends on your heating preferences, property parameters, and heating system setup. However, you’re able to find the best oil boiler models from the three boiler manufacturers below.

  1. Warmflow oil boilers: Warmflow’s oil boilers are some of the best for three reasons. Firstly, Warmflow produce some of the most efficient, ++A-rated oil boilers on the market. Secondly, Warmflow’s oil boilers are equipped with high-performance, long-lasting parts, such as Riello blue flame burners, Grundfos pumps, and Honeywell diverter valves. Thirdly, Warmflow oil boilers come with 5-year standard warranties, which are quite long for an oil boiler range. The Warmflow oil boiler range includes the U-series and B-series indoor boilers and K-series external oil boilers.
  2. Grant UK oil boilers: Grant oil boilers are some of the best because of their high efficiency levels of around 93%, and relatively long warranties. Grant have an extensive lineup of internal, external, wall-, and floor-mounted boilers from which to choose.
  3. Worcester Bosch: Worcester Bosch oil boilers offer advanced controls, 90%+ fuel efficiency, and some of the longest oil boil warranties, at 7 years as standard. Worcester Oil boilers come in two ranges, the Greenstar Danesmoor and the Greenstar Heatslave II, as well as combi, system, and heat-only boiler types.

Finding the best oil boiler for your property may not be as simple as selecting a suitable gas boiler, since few companies offer online quotation and selection tools. Your best bet for finding the most appropriate oil boiler for your home is to speak with an OFTEC-certified heating engineer.

Which is the best LPG boiler?

The best LPG boiler is really any boiler that’s best suited to your property parameters and heating needs. The overwhelming majority of premium gas boilers, such as those manufactured by Worcester Bosch, Viessmann, Vaillant, Baxi, Alpha, and other top brands either come in both gas and LPG models or are convertible to LPG with a special kit. These LPG-compatible boilers are no different than their natural gas-fired peers, they just have a different fuel supply system. Doing diligent research to find the most appropriate boiler for your home is the most important step to finding the best boiler, whether it’s powered by mains gas or LPG. If you’re not sure which boiler makes the best fit for your circumstances, try using Heatable’s online boiler selection tool. This tool recommends a range of appropriate boilers (mains gas and LPG) by taking into account your property details and heating system setup.

Which is the best LPG combi boiler?

The best LPG combi boiler in 2024 is the Worcester Bosch Greenstar 4000. The LPG version of the Greenstar 4000 combi is the best for the same four reasons its mains gas counterpart wins the top combi spot of 2024. The Greenstar 4000 LPG combi is ErP A-rated, conserves water with its Quick Tap feature, comes with a long, 10-year warranty (when installed by a Worcester-accredited installer, or Heatable), and is reasonably priced at around £2,500, including installation.

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Which is the best LPG combi boiler for a static caravan?

Worcester Bosch Greenstar CDi Compact 28kW is the best LPG combi boiler for a static caravan. The CDi Compact 28kW is an appropriate LPG combi for a static caravan because the model is small in both physical dimensions and output. The compact size allows this combi to fit into a cupboard, thus helping you save precious space in the caravan. Meanwhile, the 28kW output is well-matched to a typical static caravan, where any larger boiler would be a waste of upfront and running costs.

That said, the CDi Compact is not particularly cheap, with boiler-only costs of £1,100 – £1,500 and fitted costs closer to £2,500. You may find a cheaper LPG combi for your caravan in Ariston’s Combi One range, where the average boiler-only price is well below £1,000.

Which is the best boiler for 4 bed house?

Below are the three best boilers for a 4-bed house, sorted by boiler type.

  • Best combi boiler for a 4-bed house: Vaillant ecoTEC Plus 36kW is the best combi boiler for a large house with 4 bedrooms and several bathrooms. The ecoTEC Plus 36kW has sufficient heating capacity to serve the many radiators such a large home has and an impressive 17 litres per minute flow rate to satisfy the potentially high domestic hot water demands.
  • Best system boiler for a 4-bed house: Worcester Bosch 8000 Style 35kW is the best system boiler for a 4-bed house. The 8000 Style 35kW is a powerful boiler that easily handles the heating demands of a large property, whilst offering user-friendly features such as intelligent filling and smartphone integration.
  • Best heat-only boiler for a 4-bed house: Worcester Bosch 8000 Life is the best heat-only boiler for a 4-bed house. The Greenstar 8000 Life has an impressive efficiency of 94% and has Worcester’s longest standard guarantee of 12 years.

Check Heatable’s online boiler selection tool to see which boiler is best for your 4-bed house.

Where to find the best new boiler deals in the UK?

Find the best new boiler deals at Heatable, an online boiler installer that offers some of the lowest boiler prices in the UK. Heatable are able to offer incredible deals on premium boilers thanks to their online business model and low overhead. Searching for new boiler deals via Heatable is straightforward, quick, and anonymous. You start by inputting some key information about your property, such as the number of beds, baths, and existing heating setup. Heatable’s calculator then recommends a range of suitable boilers, along with fixed-price quotes. You may proceed and order the boiler there and then; or, you may hold onto your quote and use it as a benchmark as you get more estimates from local heating engineers. Try Heatable’s boiler selection tool here.

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What is the best boiler cover?

WarmZilla’s HomeZilla is the best boiler cover in 2024. WarmZilla offer a range of cover packages, all of which fall under a reasonable and affordable premium. The WarmZilla boiler cover offers four levels of cover: Basic, Extra, Plus and Total Plus. Each cover comes with no excess fee. However, homeowners can opt for a lower monthly premium for each package in exchange for a fixed excess payment of £89. Within the range of WarmZilla boiler cover plans, the Plus Plan offers the best value. It’s a mid-range option that provides cover for an annual service, repairs to the boiler and controls, central heating system, and plumbing and drains. The only item excluded from the cover is home electronics.