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Mains water getting hot when CH is on! What the heck is that about?

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Discuss Mains water getting hot when CH is on! What the heck is that about? in the Bathroom Advice area at Plumbers Forums

Savva

Savva

Gas Engineer
Messages
55
I went to do a safety cert the other day on a Main 30kw Combi. When I called for heat, as well as the F&R pipes heating up, so did the mains supply pipe to the boiler! Had a quick look and the further from the boiler the cooler the pipe...any ideas what's causing this? Thanks guys
 

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