"Ed Sirett" wrote in message
...
On Sat, 26 May 2007 19:54:51 +0100, Doctor Drivel wrote:

"Jim Alexander" wrote in message
k...

"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.

If the hob is just too much for the gas pipe. it is best to run a 15mm
for
the hob back to the meter - cheaper.

Without seeing the entire layout, existing fittings, materials and methods
of construction. The 'best' way to improve the layout of the gas
installation is no more than educated guesswork.

Anyone who knows anything about gas supplies has the boiler on its own
independent gas supply.