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Vaillant ecoFIT sustain system review

£1,252.00 Typical price

Brand score %

Key features
  • Gas
  • System

Designed for new builds and social housing the ecoFIT Sustain system boiler is small enough to fit inside a kitchen cupboard and comes with an A rating for energy efficiency. But you’ll be most interested in how well Vaillant boilers fare in our annual reliability survey and to find out if heating engineers would recommend them. Read our full review to find out.

Included in our expert review
  • Pros and cons
  • Heating engineer views
  • What type of home is this boiler suitable for?
  • Will this boiler produce enough hot water for my home?
  • How efficient is this boiler?
  • What controls does this boiler have?
  • Is this boiler smart compatible?
  • What is the warranty with this boiler?
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Brand scores

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

Find out how we assess boilers
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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.

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