Boiler guides and advice

5 tips to reduce your heating bills

Learn how to make your homes central heating system the most efficient possible and reduce your heating bills. Find out how to check if your system is clean and balanced and how to set up your boiler so it is working efficiently.

How to thaw a frozen boiler condensate pipe

Boiler stopped working in a cold snap? Find out how to thaw your boiler's condensing pipe and get it back in working order, without calling a heating engineer. This simple fix could save you hundreds of pounds on a call-out.

Best oil boiler brands

Do you need a new oil boiler? Here's our guide to the best oil boiler brands. We reveal the most reliable oil boiler brand - use our research to buy an oil boiler you can trust. Worcester Bosch and Grant oil boilers rated.

Boiler controls and thermostats

Use this boiler controls and thermostat guide to make your boiler more efficient and ensure you're not wasting money on your central heating. Learn how to best optimise your heating using those often fiddly controls.

Buying an oil boiler

Looking for a new oil boiler? Find out which are the best and worst oil boiler brands, how oil boilers work and how they differ from gas. Worcester Bosch and Grant oil boilers rated for reliability and customer satisfaction.

Which boiler brand to buy in 2019

Find out which boiler brands are the most reliable. The reliability and overall quality of all the major UK boiler brands are put to the test in our two annual surveys of customers and expert heating engineers.

Boiler brand guides

Find out which are the best and worst boiler brands. Boiler owners reveal how reliable their boiler brand is. Plus build quality according to heating engineers.

How we assess boilers

Which? explains how it uncovers the best and worst boiler brands. Thousands of boiler owners and hundreds of expert heating engineers are surveyed, so Which? can reveal the best and most reliable boiler brands for your home.

Getting the best boiler service

Use Which? expert tips to get the best boiler service you can, you should have a boiler service every year. Read the shocking results of our undercover investigation into servicing and download our boiler servicing checklist.

Boiler energy efficiency

Cut your energy bills by learning more about boilers and how boiler efficiency ratings are calculated. Our analysis reveals if a new boiler will save you money.

Common boiler problems and repair costs

Which? reveals the most common boiler faults and how much it should cost to fix them. Find out how much you should be charged, so you can sense check your quote against the average cost quoted by almost 200 heating engineers.

Best combi boiler brands

If you want to buy the best combi boiler, you'll need to make sure that you buy the correct size for your home, and that it's from the best combi boiler brand for reliability, satisfaction and according to heating engineers.

How to balance your radiators

Find out how to correctly balance your home's heating and increase its efficiency. We show you how to tell if your radiators are properly balanced and explain how a trained professional will balance them.

Five signs you need a new boiler

When is the right time to replace your boiler? From high fuel bills to carbon monoxide leaks and costly repairs, we reveal the warning signs you shouldn't ignore in your home

Boilers advice guides

Best boiler brands

Buying a new boiler

How to buy the best boiler

Put us to the test