Its common for multi fuel stove makers to state 28mm copper on the primary flow and return for their appliance. I have seen 22mm primaries in many houses that have been plumbed over the decades!
Yes I know you just follow manufacturers instructions, but wonder why others have "got away" with 22mm copper pipework on gravity circulation?
Yes I know you just follow manufacturers instructions, but wonder why others have "got away" with 22mm copper pipework on gravity circulation?