The Top 5 Boilers of 2021


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In this article we take a look at the top 5 boilers of 2021.

The boiler in your home. It’s an unassuming, yet essential part of every day life. In fact, you probably don’t give it another thought unless something goes wrong.

If you need to replace your boiler, it’s not just the price that matters.

Firstly, you need to consider the size and output of your boiler for your household needs. This can save you money in the long run. Then, you need to choose who installs it. Choosing an engineer from the same boiler manufacturer can even extend your warranty.

Also, there’s efficiency.

Choosing the most efficient boiler can not only save you hundreds of pounds on your energy bills, it can also make a difference to your impact on the environment as well.

At NeedBoiler, we’ve put together the top 5 boilers of 2021, based on different categories.

Top 5 Brands of Boilers

1. Worcester Bosch

The first of the top 5 boilers of 2021 is Worcester Bosch began in England in 1962 as Worcester Engineering Co Ltd. In 1992, the company was acquired by Robert Bosch, adopting the new name of Worcester Bosch.

It’s now a prestigious brand in the heating industry and has won the Which? Best Buy award for the past 11 years. As well as this, there are many excellent customer reviews.

2. Viessman

The Viessmann Group began in Germany in 1917 and is still owned by the Viessmann family. It’s an international brand with several production and distribution companies around the world.

The Viessmann Vitodens brand of boilers is their best selling range of gas boilers. Vitodens boilers are known for being compact, energy efficient and economical with a reputation for quality and reliability.

3. Vaillant

Another German manufacturer is Vaillant. This is another family owned company, which began in Germany in 1894. The Valiant Group is one of the largest companies of its sector in Europe.

Since 2006, the company has turned its focus to technologies based on renewable energies. As a result, the company has won several environmental and sustainability awards.

4. Baxi

Baxi began over 150 years ago in Preston in Lancashire and continue to manufacture boilers in England, selling them across Europe. The current Baxi Group formed in 2000 by the merger of Newmond plc and Baxi Holdings plc.

Baxi services are approved by Which? Trusted traders and the boilers get excellent reviews on Trust pilot.

5. Ideal Heating

Our fifth brand of the top 5 boilers of 2021 is Ideal Heating which began in 1906 in England, so the company has over 100 years of providing boilers for the UK domestic market. Since 2015, Ideal has been owned by Groupe Atlantic, a French company.

Ideal heating is also endorsed by Which? Trusted trader and the Energy Saving Trust.

Why Boiler Efficiency Is Important

You should only really think about the boiler’s efficiency rating once you have got the correct size and type of boiler for your home. A more efficient boiler can save you a lot of money on energy bills.

The ErP energy rating came into place in 2015. It’s a European energy label that all modern boilers are rated on. Nearly all UK boilers get an A rating on this label, so it can be more useful to look at the percentages to compare boilers.

Then you can see how efficient they are at converting fuel into heat. A-rated boilers score over 90% for efficiency, while G-rated boilers come in under 70%.

Here are some examples of the most efficient boiler models.

Viessmann Vitodens

This combi boiler has an efficiency of up to 97% as well as the potential for a 10 year warranty. It comes with a digital interface so it’s easy to use and follow. As well as this it produces low C02 emissions.

Moreover, it’s the winner of the 2019 Which? Best Buy Award, so it’s got a good recommendation.

Ideal Evomax

If you need a conventional boiler, the Ideal Evomax with 40KW output has an efficiency of 96.2% According to the Ideal website, it’s the UK’s number 1 commercial boiler and winner of the Commercial and Industrial heating product of the year in 2020.

Worcester Bosch Greenstar System

The Worcester Bosch Greenstar, I and compact boilers come with efficiency levels of 94%. However, if you add a smart controller, it can take the efficiency up to 98%.

How to Choose a Good Warranty

Another important choice is the warranty that comes with the boiler. You may want to choose a cheaper boiler, but in the long run, you’ll find a better deal with a good warranty that could save you a lot of money in repairs.

Looking at our list of top 5 brands, the warranties are like this:

Worcester Bosch offer a guarantee with their boilers as standard which vary in length. It starts at 5 years but this can extend to 10 years if you choose a local Worcester Bosch accredited installer to install the system along with a Worcester Bosch Greenstar system filter. An even bigger 12 year guarantee comes with the Lifestyle boilers, if using the same conditions.

Viessmann offer warranties on their products from 2-5 years as standard. The warranty extends if the boiler is installed by a Viessmann trained installer. So a Vitodens boiler with a 3 year warranty can extend to 7 years. They also offer upgrades at a price. Hence you can extend your warranty up to 12 years if you choose to pay for it.

Meanwhile, Vaillant offer a guarantee from 2-5 years as standard. However, this increases up to 7 years if you use a Valiant installer. A 10 year guarantee is available on some of the boilers, but you have to get in touch with a Vaillant installer and ask for further information.

Baxi offer warranties of up to 10 years on three conditions. You must register the warranty within 30 days, make sure your installer completes a Benchmark checklist and have your boiler serviced every year by a Gas Safe registered engineer.

Finally, Ideal Heating offer a 7 year warranty on their boilers. You must also register it within 30 days, and it should be installed by a gas safety engineer, although not necessarily an Ideal brand engineer.


As you can see, buying a new boiler is not as straightforward as how much it costs. As heating our homes makes an impact on the environment, it’s important to take other aspects into consideration too.

An efficient boiler at the correct size for your home will make a big difference on your energy bills. You could save up to £200 a year just by replacing an old G rated boiler with an A rated one.

Visit NeedBoiler and pop in your postcode on the website. It will link you up with Gas Safe Registered installers in your local area who will be only too happy to talk through your options.

Get in touch today via email phone 01603 528069 or visit the website for a quote.