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Boiler Brand Guides

Viessmann Boiler Guide

By Matthew Knight

Article 14 of 17

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

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

Thousands of Which? members take part in our annual survey of boiler brand reliability and customer satisfaction, which enables us to guide you to the best and worst boiler brands. We also conduct a survey with more than 200 trusted boiler engineers to get their independent views on which boiler brands are the best.

Boiler brand guide
Brand data for Viessmann boilers
Overall score M
Customer score
Engineer recommendation
Build quality
Availability of parts and spares
Ease of fixing a common fault
Ease of servicing
Table notes
The reliability and customer score are based on responses from a survey of 9,610 Which? members about their boilers that took place in May 2017. Reliability sample size (118).
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 survey of 219 Which? Trusted Trader heating engineers that took place in May 2017.


Member Content

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.