In article . com,
"mmccar" writes:
I had British Gas around last week to see if I could replace my
existing wall mounted boiler in the kitchen with a combi, allowing me
to ditch the ShowerMax in the bathroom. They informed me that as of
April this year, all new Combi's must be condensing, which require a
22mm feed. Unfortunately, my existing boiler has a 15mm feed, the 22mm

There's a mistake here. The larger pipe is because it's a combi,
and nothing to do with it being condensing.

--
Andrew Gabriel