We use cookies to allow us and selected partners to analyse site performance to improve your experience and for advertising. By continuing to use this site you consent to our use of cookies as per our cookie policy which also explains how you can change your cookie preferences at any time.

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

Which? boiler brand reviews tell you which are the most and least reliable boilers according to our survey of thousands of boiler owners. We also tell you what expert heating engineers make of each brand. For a quick decision on which brands you can trust, and which you can't, head straight to our round-up of the best boiler brands.

Displaying 28

Viessmann boiler reviews