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This question keeps coming up in different postings as to what pressure your local natural gas utility is guaranteeing you?
It used to be when I worked for the utility we gave 7" to 10" W.C. as an answer. I am now hearing 4" W.C. pressure. Be advised on demand water heaters, Mod/Cons etc can not run on those low pressures. So that limits what areas those can be installed.
I had a recent job for a church that needed 1,250,000 for the boiler the utility could only give us 5" pressure so we had to install a three inch pipe line to the boiler.