When it comes to winter warming, you can't beat gas central heating. It's been keeping us cosy for more than half a century.
But when your beloved boiler packs up, be prepared for a change - because gas heating can't play a part in zero carbon Britain.
At some date in the future, you will need to install clean heating. And be warned - it won't always be cheap, or convenient.
What's more, we'll have to radically improve insulation, too, because some of the new-style kit can't heat the UK's cold, draughty houses.
There are two main contenders for the £28bn market to heat our homes - hydrogen and heat pumps
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