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Thanks Simind, much appreciated and very informative! The boiler is one of the 'older' style ones with two knows, one for heating and one for HW - do you still think it could be the range rating though? Many thanks again, Shane

Hello I have a valiant boiler eco-tech plus. The hot water is working fine however, heating no matter what temperature, goes into (what I think to be) anti-cycling mode. This results in the heating never going above a lukewarm temperature. Without knowing anything about boilers, plumbing or...