Rheem RTG-64XLP 6.4 GPM Low NOx Outdoor Tankless Propane Water Heater Propane Tankless Water Heater Outdoor 6.4 gal/min. at 35 Degree Rise UMC-117 remote control and 10-Feet of thermostat wire is included Low Nox Version Propane Tankless Water Heater Outdoor. 5.6 gal/min at 45 degree F rise 6.4 gal/min. at 35 Degree Rise UMC-117 remote control and 10-Feet of thermostat wire is included Low Nox Version