weather compensators and passive gas flue heat recovery

[Rachel Mitchell]

As we are all trying to squeeze SAP assessments as far as possible to avoid using any renewables can anyone comment on the best combinations for building services and controls?
I've been advised that I cannot put gas flue heat recovery with a weather compensator- is this correct? and if so why?

[Alan Clarke]

I'm really sceptical about flue gas heat recovery – offering far more energy into the hot water than can possibly come out of the last few percent on heating combustion efficiency (maybe it works with really inefficient boilers and high heat loss houses – but there are other fixes for those).

The point about weather compensation is that this will ensure the boiler is already operating at maximum efficiency, with flue gas temperatures down at 40C say, and there is no heat left to be recovered from the flue gas.

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