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Hi Tony, Thanks for your response. Sadly the company that fitted the water main didn't even give me an option! i wish i knew 32mm was feasible. As your the heating engineer, i explained what we were having and he just said a 35kw combi would be fine so it would appear i've been ill advised.

So bottom line, for all their talk of flow rates and kw output, the reality is combi boilers just can't hack the demand on their own regardless of how high the output?

Hi Dan, Thanks for the reply. Sadly because of the loft conversion we were too limited on space to get a cylinder. You say about running 22mm from the boiler to the split but this surely isn't possible beacue the boiler only has 15mm DHW outlet? Also i'm afraid i don't know the static and...

Hi All, I am totally renovating my home i've just bought. We've ripped out al the plumbing plus had a new 25mm MPDE water main installed with good pressure. We're doing a loft conversion so there will be a total of 3 floors with 2 bathrooms (1 on each upper level). I am trying to design the...