On Tue, 27 Sep 2005 21:57:48 +0100, in uk.d-i-y "Doctor Drivel"
wrote:

The condensing boiler can use 22mm pipe where 28mm would be required for
a
non-condensing boiler.

Could you explain why there is a difference between the condensing boiler
and a non-condensing boiler?
I can't see why there would be a difference.