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Add-ons to recover energy from combi gas boiler exhaust?

Started by rjmusto, December 15, 2020, 07:48:52 PM

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Hi All,

We have a relatively new  combi gas boiler.  Even though new (Worcester model installed 1 year ago), I am surprised to find out that having exhaust gas temperatures of around 50degC pumping out into the atmosphere is normal.  Strikes me as a heck of a waste of energy.

I have seen that Worcester themselves make an add-on for the flue pipe that can be used to recover some energy from this, but they themselves don't seem to think it is worthwhile - and it is pretty expensive at close to £1000.

Has anybody got experience of fitting some kind of heat exchanger to the flue pipe of a gas boiler?  There are no doubt implications in terms of proper function of the boiler and warranties etc, but it just seems crazy to chuck out such hot air!


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