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

View the thread, titled "Mains water getting hot when CH is on! What the heck is that about?" which is posted in Bathroom Advice on UK Plumbers Forums.

Savva

Savva

Gas Engineer
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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Reply to the thread, titled "Mains water getting hot when CH is on! What the heck is that about?" which is posted in Bathroom Advice on Plumbers Forums.

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