On 25 June, 22:16, 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.

Instead of simply blaming the governeor he should fit his manometer to
the test nipple on the meter and measure the pressure at the meter
with the appliances running. Unles you live in a bugalow with the
meter close below the boiler I would say the pipe is likely to require
uprating.
Transco will probably tell you the same thing