"Harry Bloomfield" wrote in message
...
Jim Alexander was thinking very hard :
Firstly, can't help unless you say how long the existing pipe run is
from the meter to the boiler.

Secondly get some more quotes, not just to benchmark prices, but also
proposed method.

The 22mm pipe is around 8m long, feeding a never used gas pipe, the boiler
and a gas hob (electric oven).


OK, look at the recent "combi size advice" thread for some background. Did
a confidence check using you data assuming a largish combi and a full cooker
and the results are bordeline for 22mm pipe, hence I predict your installer
is trying to slip in a combi and has probably reasonably advised larger
diameter pipework. But if by regular you mean non-combi, there should not
be a problem with using your existing pipework.

Perhaps the main lesson is that as the customer you need to specify at least
the type of boiler you want. As far as make and model is concerned, fraid
there is no consensus.

Jim A