To be honest, I find the whole thing about number of bends in gas pipes between feed and boiler/BTU calculations seems to be very... vague. This stuff was needed for the city permit (again, something which I, uhhh, didn't do in advance because in the UK you don't ask the council when you want to change your boiler).

I never thought gas would have problems getting around corners, but it seems that it does, allegedly. Anyone know WHY?