UK’s top-rated boiler brand

We are proud to announce that our entire gas and oil boiler range has been awarded the Which? Best Buy – ranking top for both fuel types.

For our gas boiler range, it‘s the 12th year we’ve received a Which? Best Buy endorsement and a third consecutive year for our oil range.

which award 2021

Scoring exceptionally where it matters, notably for reliability, build quality, customer score and engineers' recommendation.


Our Which? Best Buy 2021 covers

  • All Greenstar gas boilers incl. our newest 4000 range
  • All Greenstar oil boilers

Our Which? Best Buy Brand covers

Did you know?

quiet mark

Quiet Mark

Our Greenstar 2000 and 4000 are Quiet Mark certified.

Hydrogen Blend

Hydrogen Blend

Our entire gas boiler range is able to run on a 20%.



Our customers have consistently rated us ‘Excellent’ on

Discover our Greenstar 4000

Built on all the tried, tested and much-loved features of the Greenstar i, the Greenstar 4000 is instantly familiar and yet totally transformed.

Find out more


Which? throughout the years



Worcester Bosch continues to be the best gas boiler brand. Its customers are the happiest of any brand’s customers



Worcester Bosch continues to be the benchmark against which other boiler brands should be judged.



Reliability is the single most important consideration when buying a new boiler and Worcester Bosch has it in spades

Discover our Greenstar Heatslave II

Our Greenstar Heatslave II is the UK's most popular oil combi boiler with flow rates up to 22l/min.

Find out more

heatslave II