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Hello all -
I checked Vaillant's online documentation for the Ecotec 637 plus system boiler and it says CH output is 28kw.. is it 28kw when the HW is on and 37kw if not, or just 28kw?
I checked Vaillant's online documentation for the Ecotec 637 plus system boiler and it says CH output is 28kw.. is it 28kw when the HW is on and 37kw if not, or just 28kw?