Best Which? rated boiler brand in the UK in 2020

Proud to have been voted as top boiler brand for 2020 by Which? Best Buy

Best Which? rated boiler brand in the UK in 2020

We are delighted to have been recognised as a Which? Best Buy brand again in 2020.

As a business, we remain fully committed to supporting our installers and helping them maximise their businesses. The Which? Best Buy accreditation is an important one, as it is highly regarded and well trusted by consumers.

With our entire range of domestic boilers Which? Best Buy accredited again for another year running , together with our extended guarantees of up to ten years on some models, installers can recommend Vaillant boilers to their customers with absolute confidence.

Which? surveyed more than 200 of its trusted heating and plumbing engineers their thoughts on the boiler brands they worked with, looking at installation and services, fault fixing and the availability of parts and spares. We are proud to say that once again, Vaillant are engineer’s boiler of choice, being the only brand which received the 5-star seal of approval for build-quality.

The Which? Best Buy report stated: “Vaillant is the darling boiler brand of our expert engineers. It’s the only brand with their five-star seal of approval on build quality, and they’re quick to recommend it too.”

One engineer said: ‘Vaillant is one of the top brands on the market and that’s clear when you look inside these boilers. The configuration of parts is well thought out for the engineer when repairing or replacing parts. It’s a very reliable boiler brand with a very good guarantee.’

Our latest accolade is yet another way in which we are supporting our loyal installers by making it even easier to sell the Vaillant brand to their customers.

Sign up to Advance

We want to help you capitalise on the new £multi-million TV and digital advertising campaign. That’s why we’re giving Vaillant Advance installers packs of ready-to-use marketing materials (posters, leaflets, email templates) to help you win more customers.

Once you've become a Vaillant Advance installer, been through our free product training and started registering your installs, you will be listed on our website for homeowners to search for their local Vaillant Advance installer. This will give your business great exposure to local homeowners looking for new heating or service & repair work.

Sign up to Vaillant Advance for free and find out the ways we can help you advance your business, your knowledge and your earnings.

Sign up to Vaillant Advance now

Proudly Supporting Installers - Advice and support hub

Although much of the country remains on lockdown due to the coronavirus (COVID-19) pandemic, many professionals in the plumbing and heating industry are still required to carry out front line work to ensure homes, hospitals and businesses across the UK have access to heating, hot water and other essential services. Engineers carrying out these duties need guidance from the relevant authorities to help them to look after themselves and their customers.

On the other hand, many self-employed tradespeople are concerned about the impact that the nationwide lockdown could have on their businesses, with projects being put on hold and non-essential work being cancelled.

These are unprecedented times, which is why our aim to proudly support installers is more important now than ever before.

Here, you will find the latest information from the government, NHS and industry bodies and what it means for you and your business, as well as resources from Vaillant to support your earnings, learning and wellbeing.

We are constantly reviewing the contents of this page in line with government advice, so please check back regularly and subscribe to our social media channels for the latest developments.

Coronavirus (COVID-19) news and updates

Supporting your earnings

Supporting your learning

Supporting your wellbeing

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Learn more about Vaillant products and features


Whether you need a quote or onsite support, we can help you

How can we help?


Learn more about Vaillant products and features


Whether you need a quote or onsite support, we can help you


Learn more about Vaillant products and features


Information on our range of gas boilers

Renewable Products

Everything you need to design and install a renewables system

Renewable Products

Everything you need to design and install the perfect renewables system

Heat Pumps

Air, ground and water source heat pumps

Solar Thermal

Solar thermal panels suitable for use with boilers and heat pumps

System Accessories

A range of controls, cylinders, buffer tanks and more for the perfect system

Heat Pumps

Air, ground and water source heat pumps

Air source heat pumps

Heat pumps for air source projects

Water source heat pumps

Heat pumps for water source projects

Ground source heat pumps

Heat pumps for ground source projects


Providing dedicated support during all stages of your project

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Introducing the new aroTHERM plus

Vaillant's next-generation air source heat pump

10 Year Guarantee

This one's for you

See here

Our smartest controls ever are here

senso, our most advanced range of controls ever, is here.

Contact us

Out of guarantee boiler repair line 03301003150. Any questions, comments or just simply need some advice let us know.

Instruction manuals and literature

Looking for the latest literature from Vaillant? Or just need to download an instruction manual? Click here for all Vaillant product ranges.