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Sizing Heat Sink radiator for wet hetas install

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G-laaar

Hi - I've had some conflicting advice so looking for confirmation please - what size should a heat sink radiator for a log burner/boiler be? I've been told by one installer 10% of output to water and another 20%. I can;t find aything in building regs and can;t find a HETAS document with that info included so a poitn in the right direction so I can challenge with confidence would be great please.
 

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