We recently had our pool installed and we put in a Hayward H250 LoNox heater. My neighbor had some AC work done yesterday and his HVAC guy said our heater sounded like it was getting too much gas and shouldn't sound that loud. My neighbor also said that one of the dials on the gas meter spins wildly while the heater is on. When the heater is on, it does make a loud rumbling, but is any of this abnormal? Can a heater get too much gas?