Viessmann Boiler Models, Features, Prices, and Alternatives (2024 Update)

Viessmann boilers are some of the most popular boilers currently available on the UK market. Viessmann boilers are not the cheapest compared to boiler models from other brands. However, the company’s commitment to energy efficiency and boiler longevity is evident in their reliable, low-maintenance boilers. Buying a boiler from Viessmann ensures you enjoy a standard 7-year warranty on most models, with extension options that run as long as 12 years.

All Viessmann Vitodens boilers are compatible with combi, system, and heat-only boiler set-ups and are available in a range of outputs that fit any home size and hot water demand.

Below are seven boilers that make up the Viessmann range.

• Vitodens 050-W gas boiler
• Vitodens 100-W gas boiler
• Vitodens 111-W gas boiler
• Vitodens 200-W gas boiler
• Vitodens 222-F gas boiler
• Vitorondens 200-T oil boiler
• Viessmann Vitotron 100 electric boiler

The cost of purchasing a Viessman boiler ranges between £1,000 and 2,000, exclusive of installation. The price rises to between £2,300 and £2,900 when factoring installation costs into the mix. The upfront costs of getting a Viessmann are high, only slightly below those of notoriously expensive Worcester and Vaillant boilers. However, this initial investment gets recouped during the 15-20-year Viessmann boiler lifespan through increased boiler efficiency, lower maintenance costs, and substantial warranty periods.

Viessmann boilers’ longevity is the result of quality components that are produced in-house at Viessmann’s manufacturing facilities in Germany. For example, the Viessmann stainless steel heat exchanger offers greater longevity and efficiency than the standard aluminium components used by many other brands because stainless steel is more durable under constant exposure to extreme heat and water. Viessmann boilers’ warranty periods range between 7 and 12 years, and the lengthy terms suggest that Viessmann have faith in their boilers’ durability. That said, annual boiler service is vital to preventing common Viessmann boiler problems and is a condition for maintaining the validity of the manufacturer warranty.

Finding a suitable Viessmann boiler for your home is a balancing act between choosing the ideal boiler type, size, and price. Boiler calculators like Heatable’s offer a quick means of zeroing in on the most appropriate Viessmann model for your heating and hot water needs. If you’re not satisfied with the Viessmann boiler range, the best alternatives are from Worcester Bosch and Baxi, both of which are quality brands with comparable price points.

Our review of the Viessmann boiler range below provides an overview of the boiler makers’ models, prices, features, and common problems, and helps you select the best Viessmann for your home.

What is the Viessmann boiler range?

The Viessmann boiler range is a lineup that comprises the seven residential boiler models below.

• Vitodens 050-W: The Viessmann Vitodens 050-W gas boiler is a smaller unit with an output between 3 and 35 kW. The Vitodens 050-W is best suited for small homes and flats and is available as a combination and a system boiler.
• Vitdoens 100-W: The Viessmann Vitodens 100-W is a wall-mounted gas boiler with an output between 3 and 32 kW. The Vitodens 100-W is best used in medium-sized homes with up to 4 bedrooms and 2 bathrooms and is available as a combi, system, and heat-only boiler.
• Vitodens 111-W: The Viessmann Vitodens 111-W is a storage combi boiler that’s similar to the 100-W, offering the same output of up to 32 kW but with an integral hot water storage cylinder. The internal hot water storage allows the Vitodens 111-W to satisfy a higher hot water demand, and the model is ideal for 2-4 bedroom houses with up to 2 bathrooms.
• Vitodens 200-W: The Viessmann Vitodens 200-W is the most efficient boiler in the Viessmann family and boasts an output of 19 to 32kW. The Vitodens 200-W is perfect for larger homes and detached houses.
• Vitodens 222-F: The Viessmann Vitodens 222-F is a floor-standing storage combi boiler with an integral 100-litre hot water cylinder. The Vitodens 222-F is ideally suited for households that need to replace an aging conventional boiler but prefer to do away with the separate cold and hot water storage tanks.
• Vitorondens 200-T system: The Viessmann Vitorondens 200-T is a cast iron oil-fired system boiler with an extremely high heating output. The Vitorondens 200-T is best-suited for large single- and multi-family residential properties off the gas grid.
• Vitotron 100: The Vitotron 100 is the only electric boiler from Viessmann. The Vitotron 100 offers a means of supplementing heat produced by gas or oil boilers and integrates with storage heating systems.

Viessmann are one of the best boiler brands in the United Kingdom and are respected for their high-quality, high-efficiency boilers.

Below is a more detailed overview of the five Viessmann combi, system, heat-only, oil, and electric boiler models.

What are the Viessmann combi boiler models?

The five Viessmann combi boiler models are as follows.

• Vitodens 050-W combi boiler
• Vitodens 100-W combi boiler
• Vitodens 200-W combi boiler
• Vitodens 111-W storage combi boiler
• Vitodens 222-F storage combi boiler

Viessmann combi boilers are convenient and efficient since they heat water straight from the mains and do not require hot or cold water storage facilities. The 111-W and 222-F models come with an integral tank for storing hot water, which gives these two models the ability to provide larger volumes of water than traditional combination boilers.

Below is a thorough analysis of the five Viessmann combi boilers.

Vitodens 050-W combi boiler

The Vitodens 050-W is a Viessmann combi boiler that’s ideally suited for mid-sized properties and flats, both in terms of physical dimensions and heating output. The Viessmann 050-W is a compact combi, so it doesn’t take up too much space in your home: you’re able to fit it into a kitchen cupboard. Its heating capacity is tailored to smaller properties with modest hot water consumption.

Below is a summary of Viessmann Vitodens 050-W combi boiler specifications.

• Dimensions (mm): 700 x 300 x 400 mm
• Fuel type: Natural Gas, LPG, 20% Hydrogen mix
• Hot water output: 35 kW
• Central heating output: 3.2-32kW
• Flow rate: 10.2-14.3l/m
• Efficiency rating: 92% ErP, Class A
• Key features: Compact size allows this boiler to fit into a kitchen cupboard
• Suitable for: Mid-sized homes and flats.
• Boiler-only price range: £1,000-£1,400
• Fitted cost range: £2,000-£2,400
• Standard warranty length: 7 years

Vitodens 100-W combi boiler

The Viessmann Vitodens 100-W is a mid-sized combination boiler that’s best matched with a terraced or detached 4-bed, 2-bath home. The 100-W combi from Viessmann has a flow rate of 17 litres per minute. The high flow rate helps this Viessmann boiler satisfy a greater hot water demand than its 050-W counterpart, which has a maximum flow rate of 14.3 litres.

Below is a summary of the Viessmann Vitodens 100-W combi boiler specifications.

• Dimensions (mm): 700 x 360 x 400 mm
• Fuel type: Natural Gas, LPG, 20% Hydrogen mix
• Hot water output: 34.9 kW
• Central heating output: 3.2-32kW
• Flow rate: 10-17l/m
• Efficiency rating: 94% ErP, Class A
• Key features: The Vitodens 100-W works on both natural gas and LPG without a conversion kit.
• Suitable for: Mid-sized terraced and detached homes
• Boiler-only price range: £1,100-£1,500
• Fitted cost range: £2,300-£2,500
• Standard warranty length: 7 years

Vitodens 200-W combi boiler

The Vitodens 200-W is the top-of-the-range combi boiler from Viessmann. The 200-W is the most energy-efficient Viessmann boiler, with a standard efficiency of 98%. The 100-W is likewise the maker’s quietest boiler, with a noise intensity of just 36 dB while in operation.

The following list summarises the key specifications of the Viessmann Vitodens 200-W combi boiler.

• Dimensions (mm): 700 x 360 x 450 mm
• Fuel type: Natural Gas, LPG, 20% Hydrogen mix
• Hot water output: 34.2 kW
• Central heating output: 1.9 – 32 kW
• Flow rate: 14-16l/m
• Efficiency rating: 98%, Class A
• Key features: A modulation range of 1:17 allows the 200-W to adjust its output in increments of 1/17, giving the boiler its extremely high energy efficiency of 98%.
• Suitable for: Larger, 4+ bed homes, detached houses
• Boiler-only price range: £1,600-£1,800
• Fitted cost range: £2,700-£3,000
• Standard warranty length: 7 years

Vitodens 111-W storage combi boiler

The Vitodens 111-W is one of the two Viessmann storage combi boiler models (Vitodens 222-F is the other). The Vitodens 111-W has an integral hot water storage tank, which helps this model meet higher demands for domestic hot water than most standard combis are able to satisfy. For example, the 46-litre tank stores enough hot water to be capable of filling a bathtub in 8 minutes. In contrast, the powerful 100-W combi would take 17 minutes to fill a standard bathtub, and its smaller 050-W cousin would need 21 minutes to fill a tub with hot water. Its higher domestic hot water output makes the Vitodens 111-W the ideal Viessmann for large, thirsty households that reside in detached or terraced homes.

The list below outlines the key specifications of Viessmann Vitodens 111-W storage combi.

• Dimensions (mm): 950 x 500 x 600 mm
• Fuel type: Natural Gas, LPG, 20% Hydrogen mix
• Hot water output: 33.9 kW
• Central heating output: 3.2-32kW
• Flow rate: 17-21.2l/m
• Efficiency rating: 94% ErP, Class A
• Key features: The integral tank stores hot water, thus allowing this combi boiler to function as a system boiler and increase its domestic hot water output when multiple taps or showers are on simultaneously.
• Suitable for: Mid-sized terraced and detached homes
• Boiler-only price range: £1,900-£2,100
• Fitted cost range: £2,700-£3,000
• Standard warranty length: 7 years

Vitodens 222-F storage combi boiler

The Vitodens 222-F is a large storage combi that’s suitable for households that consume lots of hot water but prefer not to have separate hot water storage facilities. This Viessmann boiler has an integral 100-litre tank for storing hot water, thus combining the functionality of a system boiler and the convenience of a combi.

The list below outlines the main specifications of the Viessmann Vitodens 222-F storage combi boiler.

• Dimensions (mm): 1400 x 595 x 600
• Fuel type: Natural Gas, LPG, 20% Hydrogen mix
• Hot water output: 33.5kW
• Central heating output: 1.9-32kW
• Flow rate: 16.4-21.2l/m
• Efficiency rating: 98%, Class A
• Key features: 100l internal hot water storage tank for increased water supply volumes during peak hot water demand
• Suitable for: large properties, 2-family homes
• Boiler-only price range: £2,600-£3,100
• Fitted cost range: £3,500-£4,100
• Standard warranty length: 3 years (5 if fitted by a Viessmann-accredited installer)

What are the Viessmann system boiler models?

Below is a list of the three Viessmann system boiler models (gas-fired).

• Vitodens 050-W system boiler
• Vitodens 100-W system boiler
• Vitodens 200-W system boiler

The selection of system boilers from Viessmann is just as efficient and powerful as the boiler maker’s combi range. However, Viessmann system boilers are better suited for families with a high hot water demand than combis, as their water supply is not limited to the mains: these boilers work with a storage tank that keeps a large volume of water hot. Note that the need for the separate hot water cylinder means that Viessmann system boilers have overall higher costs than their combi counterparts.

The following is an overview of the three Viessmann system boiler models.

Vitodens 050-W system boiler

The Vitodens 050-W is Viessmann’s smallest system boiler in terms of both physical dimensions and output. The 050-W easily tucks away into a kitchen cupboard; however, you require a domestic hot water cylinder to operate this boiler, and this cylinder requires space.  The system boiler version of the Vitodens 050-W is suitable for small homes that nevertheless consume a great deal of hot water.

The following is a summary of the specifications of the Viessmann Vitodens 050-W system boiler.

• Dimensions (mm): 700 x 300 x 400 mm
• Fuel type: Natural Gas, LPG, 20% Hydrogen mix
• Central heating output: 3.2-25kW
• Efficiency rating: 92% ErP, Class A
• Key features: Compact dimensions allow this model to be installed in standard kitchen cupboards
• Suitable for: Mid-sized homes and flats.
• Boiler-only price range: £1,000-£1,400
• Fitted cost range (including the hot water cylinder): £2,500-£3,00
• Standard warranty length: 7 years

Vitodens 100-W system boiler

The Viessmann Vitodens 100-W system boiler is well-suited for homes with up to 4 bedrooms and 2 bathrooms. The Vitodens 100-W system boiler version is similar to its combi counterpart, but is capable of supplying larger quantities of hot water and is thus more fitting for families with a high hot water consumption.

The key Viessmann Vitodens 100-W specifications are listed below.

• Dimensions (mm): 700 x 360 x 400 mm
• Fuel type: Natural Gas, LPG, 20% Hydrogen mix
• Central heating output: 3.2-32kW
• Efficiency rating: 94% ErP, Class A
• Key features: 1:10 modulation range and a high-efficiency pump that reduce the boiler’s energy consumption
• Suitable for: Large terraced and detached homes
• Boiler-only price range: £1,200-£1,600
• Fitted cost range (including the hot water cylinder): £2,700-£3,000
• Standard warranty length: 7 years

Vitodens 200-W system boiler

The 200-W is the premium system boiler in the Viessmann Vitodens range. The Vitodens 200-W boasts an energy efficiency of 98% due to its high modulation range of 1:17 and is capable of serving detached homes with multiple bedrooms and bathrooms. This Viessmann system boiler is able to satisfy a large demand for domestic hot water, but you must fit this model together with a hot water cylinder, which adds to both purchase and installation costs.

The list below provides an overview of the Vitodens 200-W system boiler specifications.

• Dimensions (mm): 700 x 360 x 450 mm
• Fuel type:Natural Gas, LPG, 20% Hydrogen mix
• Central heating output: 1.9 – 32 kW
• Efficiency rating: 98%, Class A
• Key features: The 200-W is able to modulate its output in increments of 1/17, thus tailoring its heat production and energy consumption in response to thermostat commands and changing indoor temperatures. This level of modulation allows the Vitodens 200-W to achieve a 98% efficiency rate.
• Suitable for: Larger, detached homes with multiple bedrooms
• Boiler-only price range: £1,700-£2,000
• Fitted cost range (including the hot water cylinder): £3,000-£3,300
• Standard warranty length: 7 years

What are the Viessmann heat-only boiler models?

The Vitodens 100-W is the sole heat-only boiler model from Viessmann. The conventional version of the Vitodens 100-W comes with the same efficiency and power as its combi and system boiler peers but requires cold water storage tanks to operate. This boiler is thus suitable for upgrading existing heat-only boiler setups.

Below is a specifications summary of the Viessmann Vitodens 100-W heat-only boiler.

• Dimensions (mm): 600 x 375 x 285-340 mm
• Fuel type: Natural Gas, LPG, 20% Hydrogen mix
• Central heating output: 3.2-32kW
• Efficiency rating: 92% ErP, Class A
• Key features: Compact dimensions mean this boiler fits into a standard kitchen cupboard
• Suitable for: Large and mid-sized homes with an existing traditional heating setup
• Boiler-only price range: £1,100-£1,600
• Fitted cost range: £2,300-£2,500
• Standard warranty length: 7 years

What are the Viessman oil boiler models?

Viessmann have two oil boiler models available in the UK: the Vitorondens 200-T and the Vitoradial 300-T. The Vitorondens 200-T is the only residential oil boiler from Viessmann, whilst the Vitoradial is designed for multi-family residential, commercial, and institutional applications.

The Viessmann Vitorondens 200-T oil boiler is a sleek, cast-iron appliance that’s available in two output ranges: 20.3-53.7 kW and 67.6-107.3 kW. The smaller of the two Vitorondens boilers is suitable for small, mid-sized, and large residential off-grid properties thanks to its impressive 20-53kW capacity range. The larger of the two models is more appropriate for multi-family residential and commercial buildings. Both Vitorondens 200-T models boast a 97% energy efficiency, which is on par with what the Vitodens gas boiler range offers.

The Vitorodens is significantly pricier than any of its gas-fired Vitodens counterparts. The boiler-only costs for a Vitorondens 200-T hover around £5,500, whilst the fitted costs are closer to £7,000. This price discrepancy is normal since oil boilers always cost more to buy and fit than gas-fired models with a similar capacity.

Is there a Viessmann electric boiler?

Yes, there is a Viessmann electric boiler: the Vitotron 100. Vitotron 100 is able to heat water directly (much like a gas combi does), or in concert with a domestic hot water storage tank, like a system boiler. This electric model from Viessmann has an efficiency of 99.4%, meaning that almost all the money you spend on electricity for heating is converted into heat. Such high efficiency is common with electric boilers, although they’re still incredibly expensive to operate due to the high electrical unit rates in the UK. On the upside, the Vitotron 100 is relatively inexpensive, at just £1,400 for boiler-only, and around £2,100 fitted. The relatively low upfront costs and high running costs make Vitotron 100 a suitable backup heating choice for properties that otherwise rely on biomass fuels or oil to heat their homes.

How are the Viessmann boiler prices?

Viessmann boiler prices are on the upper end of the scale, with typical boiler-only costs that range between £1,000 and £3,000. This price range places Viessmann boilers just below competing Worcester Bosch models, and substantially lower than Vaillant boilers in terms of price.

How much does it cost to install a Viessmann boiler?

It costs anywhere between £1,000 and £2,000 to install a Viessmann boiler, which means that the total cost of getting a new boiler from Viessmann is £2,000-£5,000. The three main factors that influence the cost of fitting a boiler from Viessmann (or any other manufacturer, for that matter) are as follows.

• Boiler type: Replacing your existing boiler with a Viessmann boiler of a different type makes the fitting process more expensive, as the crews must reconfigure the pipework and either install or remove water storage tanks.
• Boiler location: Fitting your new Viessmann boiler in a new location entails rerouting pipework, which adds to the boiler installation costs.
• The installer: Large, national installers typically charge more than local trades or online boiler fitters to install a boiler. National heating corporations have large overheads and brand recognition, and both of these factors allow them to charge more for boiler installations than small, local operations and online-based installers usually charge. That said, it often pays to get boiler quotes from multiple installers. For example, you can get a fixed-price Viessmann boiler quote from Heatable and use it as a benchmark as you solicit more offers from local and nationwide heating companies.

What makes Viessmann boilers so expensive?

There are two reasons Viessmann boilers are so expensive. Firstly, Viessmann use high-quality, German-made parts in their boilers. For example,  many boiler manufacturers use third-party-sourced heat exchangers made from aluminium. However, Viessmann manufacture their Inox-Radial heat exchangers in-house and use stainless steel to make them. These Viessmann-made heat exchangers cost more to produce, and so drive up initial boiler cost. However, their robust construction ensures that Viessmann boiler parts operate efficiently and have a long service life.  Secondly, Viessmann boilers employ innovative technologies to boost the energy efficiency of their boilers. For example, Viessmann boilers are fitted with the brand’s proprietary MatriX cylinder burner and Lambda Pro Combustion Control system. The heat-resistant MatriX burner allows the boiler to modulate its output whilst Lambda Pro ensures clean combustion regardless of gas quality. Consequently, Viessmann boilers consume less fuel and produce cleaner emissions than counterparts from other leading brands.

Buying a Viessmann boiler entails significant upfront costs, but the return on investment is quick to manifest, especially if you’re upgrading from an old, inefficient boiler. There are two reasons why Viessmann offer excellent value for money. Firstly, Viessmann’s efficiency levels of 92-98% mean that for every pound you spend on gas, 92-98p get converted to heat, and only 8-2p are wasted. In contrast, older boilers with 70-80% efficiency waste as much as 30p for every pound spent on your gas bill. According to the Energy Saving Trust, upgrading to an energy-efficient condensing boiler such as those made by Viessmann gives you a chance to save up to £630 per year on your energy bills if you live in a detached home. At this rate, a new Viessmann boiler would pay for itself in about 4 years. Smaller properties stand to save less by upgrading to a new Viessmann, but the replacement would still lead to significant energy savings over time. Secondly, the in-house-made components inside a Viessmann boiler are known to last a long time. Long-lasting boiler components mean paying less in repair costs and a longer boiler lifespan.

How long do Viessmann boilers last?

Viessmann boilers typically last around 15 years, and the standard Viessmann warranty indicates that the boilers should operate without any faults for at least 7-10 of those years. A manufacturer’s warranty length is a reliable indicator of how long the boiler maker expects their product to last before parts require repairs.

Servicing your Viessmann regularly is an effective way to prolong the boiler’s longevity and prevent minor faults from deteriorating. Likewise, annual boiler service is a condition for maintaining the validity of your Viessmann warranty. Viessmann boiler service typically costs around £100 per year.

How long is the Viessmann boiler warranty?

The Viessmann boiler warranty is 7 years long on average, but you often have the option to extend it to either 10 or 12 years, depending on the model. All Viessmann boilers come with a separate, 10-year warranty for their stainless steel heat exchangers.

The Viessmann warranty lengths are summarised in the table below.

Viessman boiler range
Model	Standard warranty	Extended
Vitodens 050-W	7-year warranty	10-year warranty
Vitodens 100-W	7-year warranty	12-year warranty
Vitodens 111-W	7-year warranty	12-year warranty
Vitodens 200-W/222-F	7-year warranty	12-year warranty

Note that the Viessmann standard warranty may change depending on your installer. For example, Heatable install Viessmann boilers with standard warranty terms of 10-12 years, so you know your investment is protected should any boiler problems arise within the 1st decade of operation.

What are the common Viessmann boiler problems?

Below are the seven most common Viessmann boiler problems with corresponding fault codes.

• No hot water: A Viessmann boiler that’s not producing hot water likely has a faulty diverter valve. Valve repair or replacement needs to be carried out by a Gas Safe engineer.
• Radiators not heating up fully: The most common reasons for insufficient heating (when your Viessmann is sized correctly) are faults with either the heating pump or the Flow and return sensors. Either way, a Gas Safe engineer must diagnose the issue.
• Boiler burner blocked: Carbon build-up and flue sensor errors are common reasons why a Viessmann boiler would signal a burner blockage. Viessmann fault codes A3, B0, F1, F-E1, and F-E2 typically signify a blocked burner, but only a Gas Safe engineer is able to diagnose the error correctly.
• Burner lockout: A Viessmann boiler returning a boiler lockout code usually has a problem with the central heating pump, and the circulation fault causes the burner to overheat and lock out. Viessmann fault codes F2, E1, E7, E8, E9, EA, EB, and EC typically indicate a burner lockout.
• Faulty boiler burner —  fault codes: A faulty Viessmann burner typically produces either a weak flame or no flame at all. Broken burners (as opposed to those that don’t function correctly due to another faulty part) cause a Viessmann boiler to display very specific fault codes, which may include F-B7, F-F4, F-F2, F-F7, F-F8, F-F9, F3, F9, F10, F13, and F4. Calling a Gas Safe engineer is the only way to rectify this issue.
• Noisy heating pump: A Viessmann boiler returning an A8 fault code indicates that the heating pump is blocked with grime and debris. Call a Gas Safe engineer to come and inspect and clean the pump.
• Boiler won’t fire up: Seeing an F5 code on a Viessmann boiler could indicate a debris-related blockage or a faulty air pressure sensor. You must call a Gas Safe heating engineer to diagnose a Viessmann boiler that’s failing to ignite.

The vast majority of Viessmann boiler errors require a Gas Safe engineer’s attention. That said, some faults may emerge from extraneous issues, such as a power cut or lack of gas supply. Often, you may be able to rectify such faults by simply restoring service from your utility company and resetting the Viessmann boiler. You’re able to reset Viessmann Vitodens boilers by pressing and holding the reset button for several seconds. The location of the reset button and the duration for which you must depress it depend on your Viessmann model’s control panel configuration.

What are the Viessmann boiler controls?

The list below provides a summary of the three primary Viessmann boiler controls.

• ViCare smartphone app: The ViCare smartphone app gives you full control over programming your Viessmann boiler’s operations and viewing fault information. You’re able to connect your boiler to the ViCare app directly if the model is Wi-Fi-enabled (all Vitodens boilers except the 100-W heat-only model offer WiFi connectivity). Alternatively, the ViCare app may be paired with the boiler using the ViCare thermostat, which is compatible with Vitodens 050-W, 100-W, and 111-W. The ViCare thermostat allows Gas Safe engineers to run diagnostics on a faulty Viessmann without coming for an in-person visit.
• Third-party controls: Most Viessmann boilers are compatible with third-party thermostats, such as Nest, Hive, and tado°.
• Colour Touch Screen: Viessmann boilers have an LED touch screen that takes the complexity out of dealing with your boiler. The easy-to-navigate, colour displays make it easy to read and understand what your boiler is communicating and adjust temperature settings.

Are Viessmann boilers good?

Yes, Viessmann boilers are good for three key reasons. Firstly, Viessmann fit their boilers with highly durable, long-lasting parts. All Viessmann boiler components are manufactured in Germany, to a high standard, and never from plastic. For example, Viessmann’s InoxRadial heat exchanger (which is subject to extremely high temperatures, water, and pressure on a daily basis) is built with stainless steel and comes with its own 10-year warranty. The durability of Viessmann components contributes to the boilers’ long lifespan that is typically free of expensive faults. Secondly, Viessmann boilers are incredibly energy-efficient. Boilers in the Vitodens range are up to 98% efficient when operating in condensing mode, meaning that 98p of every pound you spend on gas gets converted to heat. Viessmann boilers get their energy efficiency from carefully designed components that enable output modulation and thus reduce unnecessary fuel consumption. Thirdly, Viessmann boilers are reasonably priced considering how much value their energy-efficient and durable parts offer users. Viessmann boilers are not cheap, but their price range sits well below that of its Worcester Bosch or Vaillant equivalents, despite offering equal or greater value in reliability and energy waste reduction.

Is Viessmann better than Vaillant?

Viessmann and Vaillant are both good boiler brands. However, an objective comparison of the two brands’ boilers reveals that Viessmann have a slight edge over Vaillant for two key reasons. Firstly, Viessmann boilers are overall more energy-efficient, with the highest efficiency of 98% among most of the Vitodens models. In contrast, Vaillant models range between 93 and 94% in energy efficiency. Secondly, Viessmann boilers are somewhat less expensive than their Vaillant equivalents. Generally, expect to spend £100-£200 on a Viessmann boiler than you would on a Vaillant of the same type and capacity.

Despite the aforementioned advantages Viessmann boilers offer over Vaillant, both manufacturers produce premium, high-quality boilers with plenty of useful — but different — features. Thus, the most suitable boiler for your property may well be a Vaillant and not a Viessmann. Check Heatable’s online boiler selection tool to see whether a Viessmann or a Vaillant is a more appropriate fit for your property.

Which is the better boiler, Viessmann or Worcester?

Whether a Viessmann or Worcester is the better boiler depends on your preferences. Both Viessmann and Worcester are top-tier boiler makers, and their products are coveted across the UK. However, one or the other may be a more appropriate choice depending on what you need out of a boiler in the first place. The list below explains when you should choose a Viessmann or a Worcester Bosch boiler.

• When to choose a Viessmann boiler: Opt for a Viessmann boiler if you’re looking for long-lasting efficiency. The Viessmann stainless steel Inox Radial heat exchanger retains its output capacity longer than the type of aluminium heat exchanger used in a Worcester Bosch boiler. Both brands protect their heat exchangers with dedicated a 10-year warranty, but this warranty safeguards users against outright malfunctions, not the loss of performance over time.
• When to choose a Worcester boiler: Go for a Worcester Bosch boiler if you’re looking for a bulletproof guarantee that the manufacturer will fix your boiler in the event of a fault. Unlike Viessmann, Worcester Bosch offer a guarantee rather than a regular warranty on all their boilers. A Worcester Bosch guarantee translates into the promise that the manufacturer will inspect and rectify a covered fault (not merely diagnose it), without any call-out fees, as long as the guarantee is valid. This type of protection offers the ultimate peace of mind that your boiler will be up and running again quickly after developing a fault.

Still not sure which boiler manufacturer or model is suited for your home? Try Heatable’s online boiler selection tool, which will produce a range of boiler recommendations based on the (anonymous) property parameters you supply.

Which Viessmann boiler is best for my home?

Which Viessmann boiler is best for your home depends on your property configuration, hot water and heating needs, and budget. Follow the three steps below to choose a suitable Viessmann boiler for your home.

1. Choose the right Viessmann boiler type
2. Establish the optimal Viessmann boiler size
3. Select a Viessmann that’s in line with your budget

Below is an in-depth description of the three steps involved in picking the most suitable Viessmann boiler model for your home.

1. Choose the right Viessmann boiler type

Your property floor area and hot water needs dictate which Viessmann boiler type you need to get. Viessmann combi boilers are convenient and have a small footprint, which makes them ideal for smaller homes. However, combination boilers often struggle to keep up with elevated hot water demand. Viessmann system boilers are able to meet increased hot water needs but require a hot water cylinder, which adds to the installation costs and takes up more room. Viessmann’s single regular boiler (Vitodens 100-W heat-only) makes a suitable replacement for an existing, old heat-only boiler if you’ve got the hot and cold water storage facilities set up already.

Note that despite the rough boiler type guidelines presented above, sticking with the current boiler type is almost always the most economical option. Getting a new Viessmann in a type that doesn’t match your existing heating setup entails extra work during the installation, which ultimately inflates the overall boiler costs.

2. Establish the optimal Viessmann boiler size

Choosing a properly sized replacement boiler is imperative if you wish the heating and domestic hot water systems to run efficiently and meet your demands. Buying a boiler that is too small for your heating demands has three core drawbacks. Firstly, your radiators may not get hot enough to maintain the desired room temperature. Secondly, the flow rate may not result in a sufficient volume of water coming out of the taps or showers. Finally, a Viessmann boiler that is too small is bound to undergo undue strain while trying to keep up with the central heating and hot water needs. The result is excessive wear and tear on the boiler’s parts and premature breakdowns. all of which translate into high maintenance costs. At the same time, getting a boiler that’s too large is a waste of money, as higher-capacity models tend to cost more than lower-output boilers.

The table below offers a rough estimate of the required boiler capacity based on property parameters.

Boiler Size	Radiators	Bathrooms	Property Type
24kW-27kW	10 or less	1	Smaller properties. Typically, apartments and 2-bedroom terrace houses.
28kW-34kW	10-15 radiators	2	Medium-sized properties. 2-4 bedrooms.
35kW-42kW	15-20 radiators	2	Large properties

However, note that the boiler sizes above are only rough guidelines. To size your new Viessmann boiler accurately, try using Heatable’s online boiler calculator. Heatable’s tool accounts for various property parameters as it calculates the most suitable boiler size and offers a list of recommended boiler models.

3. Select a Viessmann model that’s in line with your budget

Choosing a Viessmann boiler that fits your budget entails an in-depth evaluation of the initial purchase and installation costs. The upfront cost of a Viessmann boiler ranges between £2,300 and £3,300, and the thousand-pound difference is significant. Opting for a high-capacity Vitodens 100-W over the much pricier 200-W model may be a wise budget decision if you don’t mind sacrificing a bit on efficiency and the modulation range. On the other hand, choosing the even cheaper Vitodens 050-W may not be practical if your heating and hot water demand exceeds that model’s capacity.

However, note that the same Viessmann model may have different price tags depending on who installs it for you. You’re ultimately purchasing the new boiler through an installer, so it pays to do thorough research and solicit multiple quotes before you sign an installation contract. Heatable are an appropriate place to start your search since their estimates are near-instant, free, and anonymous, and the prices you see on your screen are fixed. It takes a mere 90 seconds to get a Viessmann quote from Heatable, which you’re then able to use as a benchmark while continuing your search. Ideally, you’d get at least two more boiler quotes before making up your mind to ensure you’re getting the best deals possible.

What are the alternatives to a Viessmann boiler?

Below are two alternatives you should consider if you are unable to find a Viessmann boiler to your liking.

• Worcester Bosch: Worcester Bosch is a premier name in the boiler and heating market. The price point of a Worcester Bosch boiler is slightly higher than that of a comparable Viessmann model. However, Worcester have a broader boiler selection, so they are a solid choice if the Vitodens range doesn’t have a model you like.
• Baxi: Baxi are a reputable and reliable boiler manufacturer that have become an established presence in the UK over several decades. Baxi boilers are on the market at a lower price point than those in the Viessmann range and offer an affordable, high-quality boiler for those on a budget.