American Standard® Gas Water Heater, Series: GN Series, 40000 Btu/hr Heating, Natural Gas, 40 gal Tank, Spark Ignition, 3 in Vent, 38 gph Recovery, Energy Factor: 0.64, 3/4 in NPT Water Connection, 150 psi, Tall or Short: Tall, Ultra Low Nox: Yes, Magnesium Anode Rod/Steel Tank, 20-5/16 in DiaWater Heater Kit Includes:(1) 40 Gallon R16 ULN Water Heater(2) 18" COPPER WATER HEATER FLEXIBLE CONNECTOR(1) 18" GAS CONNECTOR WITH BALL VALVE(1) EARTHQUAKE BRACKETS

Vaporshield technology - Shuts off gas and air supply to heater to prevent prolonged vapor burn in combustion chamber should accidental or unattended ignition of flammable vapors occur outside the water heater
* Maintenance free
* Standard thermocouple
* Self-cleaning, Non-CFC foam insulated
* Heavy gauge steel tank, glass-lined tank, magnesium anode rod
* Factory installed dielectric hot and cold Water connections
* Brass drain valve, factory installed heat traps
* Temperature and pressure relief valve
* Factory installed energy cut-off system
* All models are certified at 300 psi test pressure and 150 psi working pressure