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John thank you very much for such a detailed explanation very kind of you indeed, I also had another reply from Vissman which they said "The 32kW will require a supply pressure of 3.69 m3/h for maximum output but will modulate down as heating demand reduces, As with any Combi, or storage Combi...

So why would anyone go for smaller one as the princes isn't that much different

After a lot of research I thought viessmann vitodens 222 would be the best as we have a high water usage and this comes with 100l tank also its very efficient and have modulation ratio of 1:17. We have a 5 bed 3 bathroom and 19 radiators and our water flow is about 30, when I asked the plumber I...