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Old Account
If you are really going to hire a fully gas qualified engineer then you could ask him directly as he will surely give you then an update on your questions.What's the point of the forum if people can't come here and ask for advice!
The reason I disagreed with your post 33 is that it agreed with Chalked, who said in post 31 that I should use a GSR. I have already stated countless times that I will not touch the gas myself and will use a GSR!!!
I am trying to establish whether there is an alternative to running 20 feet of 22mm pipe on the outside of the house, across two doors, one window and through one gate. This was the only solution offered by the installer mentioned in post 13.
He was wrong. The solution is to find the 22-15 reducer, which I now know is on the inside of the house. I also know, thanks to the helpful people here (Shaun, Snowhead, GH77 & kop, etc), that I could stick with 15mm if the pressure drop does not exceed regs, or contradict the new boiler's pipe spec.