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7 July 2021

Viessmann boilers rated

We take a close look at how reliable Viessmann boilers are, as revealed by Viessmann owners.
Matthew Knight

Viessmann boilers has been in the heating market since 1917. The firm now sells products in more than 11 countries, including the UK.

Viessmann offers gas condensing boilers for any size or type of home. Its range of boilers is called Vitodens and it's available as a combi boiler, system boiler, heat-only boiler and storage combi. A variety of heat outputs and water flows are available for each type making the range suitable for any type or size of home.

You can find more details about the individual products in the Viessmann range in our Viessmann boiler reviews.

More than 7,000 members of the general public take part in our annual boiler brand reliability and customer satisfaction survey, enabling us guide you to the best and worst boiler brands. We also conduct a survey with more than 153 trusted boiler engineers to get their independent views on which boiler brands are the best.

Which? verdict on Viessmann boilers

Here, you'll find all of our survey results for Viessmann boilers, including how reliable Viessmann boilers are, what Viessmann owners think of their boiler, what trusted engineers think of Viessmann boilers' build quality, and much more.

The reliability and customer score are based on responses from a May and June 2020 survey of 7,500 boiler owners. Engineer recommendation, build quality, availability of parts and spares, and ease of fixing a common fault and ease of servicing are based on responses to a June 2020 survey of 153 Which? Trusted Traders heating engineers.

Which? members can log in to see what owners and engineers make of Viessmann boilers. If you're not already a member, try Which? to get access to the scores in the table below.

Overall score
Customer score
Engineer recommendation
Build quality
Availability of parts and spares
Ease of fixing a common fault
Ease of servicing

How much do Viessmann boilers cost?

Viessmann boilers cost between £740 and £1,500, depending on their type and size.

Choosing the best Viessmann boiler

Viessmann boilers are typically supplied with a two-year parts and labour warranty. 

Viessmann service enquiries

01952 675060

Viessmann repairs and spares

Viessmann's own team of engineers carry spare parts with them.

Viessmann spare parts enquiries

01952 675 013

Viessmann contact details

You can contact Viessmann by letter at:

Viessmann limited

Hortonwood 30

Telford TF1 7YP

or through its website (viessmann.co.uk).

For advice on choosing a new boiler, see our expert guide on how to buy the best boiler.