Flue gas heat recovery- cost £1,000 installed; passive

This is a device that can be easily retrofitted to your boiler flue and save up to 35% of your hot water costs with an old boiler, down to 10% on more recent models. Often new boilers have FGHR integrated within them, so make sure to check if you’re buying a new boiler.
 
Passive FGHR works simply by taking the heat that would normally disappear up the flue, and using it to pre-warm the incoming cold water.
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