10 Best Boilers Brands to Buy and Install in 2021 (Gas and Oil)

Researching the best boiler brands can be confusing — especially since all of them claim to be the ‘best.’ That’s why we’ve taken the time to craft this handy, 5-minute guide for you.

Here, you’ll learn the most essential information about the 10 best boilers you could buy, with a side-by-side price comparison between the brands. You’ll also have the chance to get a professional recommendation and fixed installation price right here on your screen.

Top 10 Best Boiler Brands Reviewed

Need a boiler replacement fast? Here is our shortlist of the best boiler brands:

Installing a new boiler is not cheap. A typical combi could cost £2,000-£3,000 including labour. And, oil boilers tend to be much more expensive.

So, picking the best boiler brand is the first part of upgrading your central heating.

The Best Combi, Regular & System Boilers of 2021

Based on fuel types, we’ve split this guide into two sections: natural gas boilers and oil boilers.

Most manufacturers will make combi, regular and system boilers that are powered by natural gas or LPG.

If yours is powered by oil, we’ve listed 3 of the best oil brands at the end of the article.

Here are the 10 best boiler brands on the market:

1. Worcester Bosch

Best Boiler Brands - Worcester BoschThe number one on our list of boiler makes is certainly the most well-known — Worcester Bosch is considered by many to be one of the best boiler brands available.

Its diverse range of boilers is known for being well-built, reliable, efficient, and the long guarantees prove that the company has great faith in its boilers. Unlike traditional warranties, Worcester’s guarantee actually means that the manufacturer is 100% committed to repairing the device should it malfunction. It’s no wonder that Worcester Bosch is widely recognized as a leader in aftercare.

Note that the exact guarantee period depends on the boiler you choose and the other Worcester-branded products you use. For instance, adding a Worcester Bosch system filter will add on a further year’s guarantee.

Worcester offer boilers types of different shapes, sizes, and fuel types:

  • Oil
  • Combi
  • System
  • Regular

Of these, the company has had the most success with models like the CDI and a Greenstar 25I/30I. These boilers are incredibly efficient and come in an array of power outputs and sizes. The smaller ones handily fit into your kitchen cupboard — great if you live in a smaller space, like most UK residents.

Price Comparison

Worcester Bosch boiler prices USED TO BE among the most expensive, comparable to Baxi and Vaillant. For instance, you can get a Worcester Greenstar 4000 30kW starting from £2,040.

Worcester Bosch Greenstar 4000 30kW

But with the launch of online boiler installers like Heatable, where you can get a quote in — literally — 90 seconds by filling out a form, high efficiency boilers from Worcester Bosch are now fitted for highly affordable prices.

You can check out their prices, by using their online boiler price calculator. It takes around 90 seconds, and no personal details are needed to get your price.

2. Viessmann Boilers

Viessman boilersIf you plan on bringing German engineering into your home, know that Viessmann are the largest boiler manufacturer in Europe; and no list of best boilers is complete without this brand.

Relied upon for their ruthless boiler efficiency and because they also tend to last longer than the competition, Viessmann boilers have snagged a Which Best Buy boilers award for being able to offer hot water and heating right when you need it.

The company’s stallions are the Viessmann Vitodens 050-W, an outstanding choice for an entry-level natural gas boiler boiler, and the Viessmann Vitodens 100-W, one of the best combi boilers on the market.

Price Comparison

The Viessmann Vitodens 050-W prices start from £1,955. The Vitodens 100-W has had a recent price drop with Heatable, and you can now bag one from just £2,395.

Viessmann Vitodens 100-W from Heatable

Both of these come with a massive 10-year warranty and the promise to have them installed the next day if you use an online boiler installation company; Heatable.

For those interested in boilers on finance, note the 2 years 0% APR on the 100 model

3. Ideal Boilers

Ideal BoilersNext on our list of best boiler brands are Ideal Boilers, a century-old, reputable British manufacturer that has grown exceptionally over the last decade. They now sell over 10,000 units per year and offer 3 types of boilers — combis, systems boilers, and heat-only boilers.

The company’s combis and system boilers are an excellent choice for smaller homes, as they’re incredibly compact and highly efficient. The combis are great if you have fewer bathrooms and showers in your home, whereas their systems peers are a better fit if your household has demanding hot water needs. They’re also ready to run on a 20% hydrogen blend out of the box.

Ideal’s combis and system boilers come with warranties ranging between 7 and 12 years — some of the longest on the market (although you’ll need a Max-certified installer to get the full 12 years — without one, it’s 10, which is still relatively long). On the other hand, its regular boilers have shorter warranty periods — from 2 to 7 years, depending on the model.

Price Comparison

Ideal Boilers are generally the odd one out. They are heading for being known as a premium brand, but they sit in the mid-range in terms of price.

The boilers that rival Worcester Bosch tend to be 10-15% cheaper when using a local installer. Of course, with Heatable being so cheap when it comes to Worcester boilers, they tend to work out at around the same price, starting at £1,995.

4. Vaillant

Vaillant BoilersVaillant are another of UK-made boiler brands right up with there with the best. Most recently, Vaillant’s ecoTEC range has become their most popular product line, and the ecoTEC exclusive with Green iQ combi boiler is the winner of the 2018 Housebuilder Products Awards. This boiler is rather powerful, with an output of either 35 or 43kW, so it’s best suited for larger homes.

That said, Vaillant has plenty of other models in this range that are suitable for smaller properties. Of these, the ecoTEC plus combi is the top all-rounder. It comes with 25kW, 32kW, 35kW, and 38kW outputs, and offers warranties between 2 and 10 years, depending on whom you get to install the device.

The ecoTEC plus combi also has a handy ‘smart’ feature that tracks your heating patterns and automatically lowers the power to a mere 16% of its full capacity when you don’t need much heat.

Price Comparison

Expect Vaillant boilers to be in a similar price bracket to Worcester Bosch and Ideal Boilers’ equivalent products. Depending on the model, the purchase and installation can set you back anywhere between £1,800 and £3,900.

5. Baxi

Good Boiler Company - Baxi BoilersBaxi’s quality rivals all the best boiler brands, including Worcester Bosch and Ideal. That said, the venerable British manufacturer (in operation since 1866) is notably less expensive than these top-shelf brands.

Like these brands, Baxi offers a range of boilers, including system, regular and combis. Each of the ranges has a massive selection of models, so picking the right one for your property might take some research and expert advice.

However, you can’t really go wrong with the Baxi 800 Combi. It comes in 25kW, 30kW, and 36kW sizes, and is compact enough to fit into your kitchen cupboard. The model has an array of features, including:

  • Magnetic filter to keep your radiators clear of sludge
  • Easy-fill permanent filling link, so you don’t need an engineer to top up your heating system
  • Opentherm interface, which lets you modulate the boiler’s operation

Parts and labour have a 10-year warranty on the Baxi 800.

Price Comparison

Price-wise, expect Baxi boilers to be slightly cheaper than a Worcester Bosch equivalent. Together with installation, you’ll pay anywhere between £1,300 and £2,100, depending on the model.

6. Alpha Boilers

Cheap Boilers - Alpha BoilersAlpha boilers are a great budget choice, perfect for landlords. Here are a few things that got them this high on our list:

  • 7-year parts and labour warranty
  • Stainless steel heat exchanger
  • Italian design and engineering

Despite being cheaper than equivalent products by some of the top-tier competition, Alpha’s boilers are known to be highly reliable and efficient. Reviews also praise them for good after-sales support.

While Alpha’s boilers come with a 7-year warranty by default, you can upgrade to a 10-year warranty if you get Heatable to install the boiler for you.

Price Comparison

The Alpha E-Tec is crazy cheap — starting at £1,675, installation included.  You can check prices online by simply filling out a form (without any personal information) — just 90 seconds to get it done.

7. Potterton

Potterton Boilers for SalePotterton don’t have the street cred of Worcester, Vaillant, or Ideal. But, they’re rated extremely highly by engineers.

The old and new boilers from Potteron are well built, and tend to last. At least that was the general consensus, until they started to trying to make cheaper boilers, which led to a reduction in warranty to just 2-years.

And, that doesn’t exactly fill a buyer with confidence.

Price Comparison

Potterton tend to sit just below Worcester, Vaillant and Baxi in terms of price; similar to the Ideal.

And, given all of the above boiler brands are bigger, and have a better service support network, those are the brands that engineers tend to install.

8. Glow Worm

Glow-Worm tends to sit in the category of “best of the rest”, with other boiler makes such as Vokera, Intergas, and Potterton.

Glow-Worm are a cheap boiler company. They tend to be used on budget renovations and rental properties.

Reliability-wise, they’re certainly not known for being up there with the likes of Vaillant, Worcester, Ideal and Baxi.

That said, they do offer 2 and 5 year warranties on their boilers, so in the short-term, they’re cost effective.

Price Comparison

It’s not all bad-news. Glow-Worm boilers are regularly priced as “special offers” at local plumbing merchants.

So, that means they are cheap to buy, and cheap to install. Expect Glow-Worm to be priced similar to Vokera boilers, if not a little cheaper.

9. Intergas Boilers

Intergas BoilersIntergas is lesser-known, yet still easily one of the best boiler brands available in the UK since it’s surprisingly reliable and efficient.

Over its 50+ years in business, Intergas has perfected a boiler design that has shockingly few moving parts — only 4, in fact. This means that there are fewer components to fail and need repairs as time goes on.

The achievement is possible because of Intergas’s proprietary 2-in-1 heat exchanger (typically, condensing boilers have 2 heat exchangers). Thanks to their unique heat exchanger, Intergas boilers don’t need a diverter valve, valve motor, auto air vent, or a secondary hot water plate heat exchanger. 

Intergas has a range of boilers of varying sizes, from 20 to 36kW. Its most recent addition to the range, the Xtreme, is a sleek, user-friendly model that features a flue gas heat recovery unit, which pushes the boiler’s high efficiency even farther than what most condensing boilers can achieve. The company’s other models include the Xclusive, Eco RF Smart Boiler, and the Rapid series — all of which come with parts and labour warranties spanning between 3 and 10 years.

Note that Intergas boilers are also 90% recyclable at the end of their lifecycle, offering a great chance to slash your carbon footprint.  

Price Comparison

Despite being a relative newcomer to the UK market, Intergas boilers aren’t the most affordable. In fact, they’re right up there with top brands like Worcester Bosch and Viessmann. Depending on the model and the size, you can get one installed for anywhere between £2,000-£3,800.

10. Vokera Boilers

Vokera BoilersWrapping up our list of the best boiler brands is Vokera — a simple, affordable choice from a company that specialises in home heating and sustainable power generation.

While it still lacks the acclaim of boiler brands like Worcester, Viessmann, and even Glow Worm, Vokera boasts that its boilers are 99% reliable in the first 2 years post-installation. The company’s warranties range between 5 and 10 years, however, so you know that the company is reasonably confident in their product.

Vokera’s range includes a series of combi and systems boilers with varying capacities. The most advanced of these is the ‘evolve C’ model, which has 5 output options, between 24 and 42kW.

evolve C comes equipped with a BeSmart internet-connected thermostat and supports OpenTherm — a communication protocol that allows you to modulate the heat output from the thermostat controls. Thanks to this vital feature, evolve C can operate at high efficiency and help conserve significant amounts of energy.

Price Comparison

The great thing about Vokera boilers is that they’re modestly priced. Together with installation, you can expect one of these boilers to set you back somewhere between £1,200 and £2,100. Considering its impressive reliability numbers and long warranties, that’s quite a deal.

What kind of fuel does your boiler use?

Grab your fixed price online by 3PM, and get next-day boiler installation.

Worcester boilers installed from as little as £1,795.

The Best Oil Boiler Brands

Not all boiler makers will produce oil boilers (also check oil boiler service cost).

So, here are the best brands to keep note of, when shopping for an oil fuelled boiler.

#1 – Grant

#2 – Worcester Bosch

#3 – Vaillant

How to Choose Which Boiler Brand to Buy?

The most important things to consider when choosing a boiler brand are:

  • Price
  • Reliability
  • Support
  • Warranty

All things considered, Worcester Bosch are the best value for money, when using an installer like Heatable.

Heatable new boiler form

If you need an oil boiler, you’ll need to use a local fitter. You can compare up to 3 quotes for Worcester oil boilers here.

Best Boiler Brands: Parting Words

Have you used any of the boilers mentioned in this article? Or any other ones, for that matter? If you have, please take the time to comment below and share your experience with our readers.



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  1. Hi
    I’m in Melbourne Australia! Is Bosch HE condensing boiler recommended for here or should I look at immergas?

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