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Boilers advice guides

15 articles
Which? boiler guides reveal tips on buying the best boiler for your home. We look into boiler prices, how much to spend on a new boiler, and rate the biggest boiler brands.

How to buy the best boiler

Expert advice on how to find the best boiler for your home. From picking the right size to the ideal type, we'll help you buy a boiler that won't let you down. Combi, heat-only and system boilers all explained.

Buying a new boiler

Buying a new boiler is a big and expensive decision. Here are five things you should know before you get a new boiler.

Five signs you need a new boiler

Boiler faults can be frustrating, costly and dangerous – but they aren't always obvious. Here are the warning signs that your boiler needs replacing

Getting the best boiler service

Find out how you can get the best boiler service to keep your boiler in tip-top condition.

Common boiler problems and repair costs

Which? reveals the most common problems with boilers, how to fix them, and how much it should cost if you can't do it yourself.

Five tips to reduce your heating bills

Find out how to reduce your heating bills and improve your home's efficiency. So you'll not only save money, but also keep warm and cosy

Best boiler brands rated

Find out which boiler brand is the most reliable and which is likely to let you down during the cold months. We reveal if a Baxi will outlast a Worcester Bosch so you know if you're investing in a quality boiler brand

Boiler brand guides

Find out whether we think Alpha boilers are a good investment. Our research reveals how reliable Alpha boilers are, and what their owners and heating engineers think of them

Best oil boiler brands

We reveal the oil boiler brands you can trust. Once you know the best oil boiler brands, use our boiler reviews to choose the right one for you

Best combi boiler brands

If you want to buy the best combi boiler, you'll need to make sure it's the correct size for your home, and from a reliable brand.

Which boilers are most energy efficient?

Find out which boilers are the most energy efficient and how it's measured.

Boiler controls and thermostats

Find out how to use heating controls and thermostats to save money on your heating bills.

How to balance your radiators

Find out how to tell if your radiators are balanced, and how to balance them.

How to thaw a frozen boiler condensate pipe

Watch our video to find out how to safely thaw your boiler's condensate pipe.

How we assess boilers

Here you can find out more about how Which? assesses boiler brands to reveal the best boilers that we recommend.