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

Not sure which are the best boiler brands? This 5-minute guide will reveal the 8 best boilers you could buy — learn more about the best brands and see a side-by-side price comparison in our research below.

Best boilers

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

We’ve split this guide into two sections.

Most manufacturers will make combi, regular and system boilers that are powered by 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 6 best boilers to buy and install, below:

1. Worcester Bosch

The number one on our list is certainly the most well known.

Worcester Bosch are considered by many to be the best boiler brand available.

They offer boilers in all shapes and sizes:

  • Oil
  • Combi
  • System
  • Regular

They’ve had great success with models like the CDI and a Greenstar 25I/30I. The warranty ranges from 5-10 years.

And, the exact warranty 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 warranty.

Price Comparison

Worcester Bosch boiler prices USED TO BE among the most expensive, comparable to Baxi and Vaillant. The Worcester Bosch Greenstar i starts from £1,770.

Worcester Bosch Greenstar i from Heatable

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-quality Worcester Bosch boilers 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

If you plan on bringing German engineering into your home know that Viessmann are the largest boiler manufacturer in Europe.

Viessman boilersRelied upon for their ruthless 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 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 just £1,670. The Vitodens 100-W has had a recent price drop with Heatable, and you can now bag one from just £2,295.

Viessmann Vitodens 050-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 Boilers are a British manufacturer that have grown exceptionally over the last decade. They now sell over 10,000 units per year.

Unlike Worcester, their warranty isn’t confusing.

Ideal offer warranties that are:

  • 2 Years – Ideal Logic
  • 7 Years – Ideal Logic Plus
  • 10 Years – Ideal Vogue (when fitted with a Ideal system filter)

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.

4. Vaillant

Vaillant are up with there with the best. Most recently, their EcoTec range has become their most popular product line.

They don’t have behind their company the branding that Worcester does, but the support network is there.

They offer great warranties and a service team to help with problems, for boilers that are under warranty.

Generally, their products have a 2, 3 or 5 year warranty attached to them.

Price Comparison

Expect Vaillant boilers to be in a similar price bracket to Worcester Bosch, Ideal Boilers and Baxi’s equivalent products.

5. Baxi

Baxi’s quality rivals all the best boiler brands including: 

  • Worcester Bosch
  • Vaillant
  • Ideal

Like these brands, they offer a range of boilers including system, regular and combis.

Price Comparison

Price-wise, expect them to be just slightly less than a Worcester Bosch equivalent.

6. Alpha Boilers

Alpha boilers are a great budget choice, perfect for landlords. A few things that got them this high on our list:

  • Alpha boilersParts and labour warranty
  • Stainless steel heat exchanger
  • Italian design and engineering

Reviews praise them for good after sales support and reliable boilers that are highly efficient.

The only issue with Alpha boilers is the price. While they seem to cost less than other boilers, you will need to find an installer to put them at work. Heatable does that. And they promise next day install, too.

Price Comparison

The Alpha E-Tec is crazy cheap (starting at £1,595) and comes with a 10-year warranty — completely exclusive to Heatable.

Check prices online by simply filling out a form (without any personal information) — just 90 seconds to get it done.

7. Potterton

Potterton 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.

That was the generally 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, and Potterton.

Glow-Worm are a cheap boiler brand. 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.

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

Which New Boiler Should You Choose?

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.

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.



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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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