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Hello all, My brother has the above combi boiler, he needs help (he certainly does!) The heating and the hot water are always on if the boiler is fired up and connot be switched on independently. This has been goin on for ages and the only was to soleve it in the summer is to turn the...

Hello Can I fit a TRV without fully draining down the system? When I tried to remove the rad the water inside was under presure and everything got v wet. I believe my CH sys is of the conventional vented type. Can anyone help, I really am out of my depth!! Cheers Jon