in LPG, heating oil, solid & other fuels
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Hi ...having a new valiant boiler being fitted In 3 weeks which requires 22 mm gas supply ,...I have 18 mm all the way to boiler at moment .....can the 18 mm be cut 3 metres away from boiler and upgraded to 22 mm to increase supply has my floors can not come up ...I have mounted wall gas pipe behind kitchen unit at the moment which can be altered if necessary
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Your RGI who is doing the install will be the best person to ask. BTW the existing pipe will probably be 15mm copper or 1/2" iron.
Some boilers have a 15mm connection for gas but usually still require 22mm up to 1m from the connection point.
Upgrading the last 3 metres will not suffice and should your RGI do that, they should be questioned.