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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Gas Boiler Efficiency and Hot Returns
Because I've got old radiators, the return to my boiler when the heating
is running is pretty high. Which means that condensing boilers, which like a return temperature below 55, wouldn't be running at peak. In fact most of the time probably won't be condensing at all! But it occurs to me that there's a nice cold fluid floating about in the system - the incoming air. If the exhaust was used to preheat the incoming air, the exhaust would be cooler and the pre-burn mixture hotter - both Good Things. Power stations have been doing this for decades. Anyone know of a domestic boiler manufacturer that uses this trick? Of course, it would probably be a convenient side effect of a good long balanced flue... Andy |
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