I dont think you’re meant to swap the gas over yourself – but it is tempting eh!
No i will then get it certified Just do a pressure test like I used to do when
installing gas hobs and ovens.
Our last boiler installation the guy screwed up and told me i had the wrong
slanted roof flue kit. Funny as Valiant only done two One flat roof kit and the other one I had.
He could not work it out and said i had the wrong kit and left an hole in the roof and
connected the flue to the boiler and wrapped a towel in the hole.
I and a friend reconstructed the flue and the incorrect flue roofing kit and sent pics
and info of before and after to the Corgi whom in return threatened court action upon myself.
I sent a returned letter wishing them much luck and be very happy to see them in court.