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Hello Alec1, thanks for advice, Have u a preference to not having a h/w tank, I have received conflicting advice about changing to a combi system. I have a newish h/w tank and have recently had a new h/w control valve fitted, it just that I'm looking to reduce my heating costs, and my pesnt...

Thank u for your reply. I'm new to this forum stuff. I seek advise as to whether I should replace my boiler with a heat only replacement or move to cambi system and loose storage tank etc?

should I change to combi from open vented system??