There will be a 2 stage reg at the tank if there’s only have 1 reg. Don’t think anything residential will take more then w/c for inlet pressure.
I chuckled at .39psi. I’ve heard 7” w/c, 4oz,
1.75 kpa, or 1/4 pound(psi) all (NG pressures) in the field.. never heard someone say it’s
.39psi inlet...