Hope I can find some help here with a gas line sizing. I am installing a 400k btu raypak natural gas heater. I have 12.2 wc line pressure and the run is approx 80‘. Of my research is correct I’m thinking I need to run 1 1/2“ pipe from meter to heater. Please correct me if I’m wrong. Would love to save a few bucks using a smaller diameter and I don’t want to over size it. Thank you in advance
