Is it possible and legal to avoid the use of 28mm gas pipe by teeing off a second 22mm pipe from an existing 22mm pipe? How close to the meter would such a 'Tee' have to be?
I have a gas CH boiler and a completely separate Worcester multipoint water heater which together are close to the limit of the existing 22mm supply.
My intention is to replace the existing Worcester multipoint water heater with a larger capacity model (Rinnai) which will require a larger gas supply, and coincidentally provide some extra capacity for a possible future CH boiler change.
Cic.