Which? uses cookies to improve our sites and by continuing you agree to our cookies policy

Worcester Bosch Greenstar Heatslave II 18/25 ErP review

Launched Assessed -

Try Which? for £1 to reveal the products that perform

Typical price


If you're looking for an oil-fired combi boiler to fit into your kitchen, the Greenstar Heatslave II from Worcester Bosch could be just the job. These floor-standing boilers can be fitted under a kitchen worktop - as long as it's removable to allow access for servicing. They have the benefit of a pre-heated thermal store to provide instant hot water, and you can fit an optional seven day plug-in timer for added convenience. Read our full review to find out whether the Heatslave II 18/25 is the right boiler for your home.
Is it worth your money?
Or is it a waste of cash?
  • Efficiency rating

    score is available for members only
  • Brand reliability

    score is available for members only
  • Brand customer score

    score is available for members only

The Which? difference

As well as thousands of impartial product reviews from our Test Labs, a Which? membership also gets you:

  • Unlimited access across which.co.uk
  • Advice on the move with our apps
  • Which? magazine delivered to your door
  • The inside scoop on important issues, from scams to savings accounts

Which? can help you make good decisions