On Tue, 30 Jun 2015 15:34:28 +0100, John Rumm
wrote:

Yup, that and also the fact that even a 35kW combi can only manage 15
lpm of water at final temperature in the winter - and that will not be a
problem with 15mm pipe.

So if I redo some plumbing if I want to have the new boiler in a
different location, I can just run one 15mm pipe and tee off to the
bathroom, kitchen, etc. It won't be a problem even if all taps are
open at once?