I'm caught up in a nightmare of a situation with pool heater technician pointing at gas line issue and gas company pointing finger at pool heater. I had a StaRite Max E therm 400K btu heater which stopped working around the time my gas meter got upgraded to 2.5 psi 800 cfh. My pool technician said it was my gas line so I had gas company come by and measure pressures before and after the regulator and near inlet to my heater which was 8.3 to 8.6 iwc. No significant pressure drop across my 2" line heading from regulator to pool heater (approx 100 ft run). Gas company technician said my pressure was sufficient. I decided to get second opinion on the pool heater and had another technician look at it who said it was probably the heater. I replaced the heater with a 400k BTU master temp Pentair which is pretty much the same model. Now the heater is still not working and technician is now blaming the gas line. I have a gas company appointment in about a week and trying to figure out what I need him to check. I'm at wits end and feel like I just spend $4K on a new heater that I didn't need. At this point I just want it to work. What exactly do I need for the gas company to check and what pressures do I need to ensure at the inlet. Manual says 4 to 14 iwc. My pool technician says at least 10 iwc. Appreciate all the help trouble shooting this.