On Friday, 25 June 2010 22:16:34 UTC+1, ernie mendoza wrote:
I have just had a new Worcester-Bosch 24i system boiler installed in
the loft to replace a 30-year-old non-condensing boiler in the
kitchen. Tests show it is "undergassed". The installer says it may
be a problem with the gas meter governor, in which case they say
Transco would have to fix it. However the 22mm pipe required by the
boiler is connected to a 15mm pipe from the gas meter. Should the
installer fit a larger pipe to the gas meter instead of blaming the
governor and shifting the problem to Transco? Any advice most
welcome.

As a GasSafe engineer. I would not leave any appliance attached to any gas pipe if the input pressure did not meet that specified in the Manufacturers Installation Instructions. If there was a problem with the meter governor, I would ask the O/P to attend.