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Note: ProMax name is now ProLine.

The ProLine® XE Ultra-Low NOx gas water heater delivers an efficient, reliable performance and features an innovative design that protects against accidental ignition of flammable vapors.

Featuring a 40-gallon tank and a 42,000 BTU gas burner, the GPNH-40 Power Vent delivers a first hour rating of 69 gallons and a recovery rate of 42.6 gallons per hour. With an 0.68 Energy Factor, this water heater is ENERGY STAR® qualified. It carries a 6-year limited warranty, and meets Ultra-Low NOx emission requirements.

  • AO Smith 40-Gallon Residential Ultra Low NOx Power Vent Gas Tall Water Heater
  • Meets AQMD Ultra Low NOx Requirements In CA, For Standard Use HD Supply Part # 754152
  • Dyna-Clean® Diffuser Dip Tube Made From Long-Lasting PEX Material Reduces Lime And Sediment Buildup To Extend Tank Life While Maximizing Hot Water Output
  • Blue Diamond® Glass Coating Provides Maximum Protection Against Leaks And Rusting Of Steel Tank
  • Exclusive Coregard™ Anode Has A Stainless Steel Core To Enhance Protection & Extend Its Functional Life
  • 0.68 Energy Factor Delivering 69 Gallons First Hour Rating
  • Electronic Gas Valve With Push-Button Piezo Ignitor And LED Diagnostics
  • LED Light Prompts During Pilot Startup And Provides 10 Different Diagnostic Codes To Assist In Troubleshooting
  • FVIR System Is Designed With Easy-To-Access Resettable Thermal Switch
  • 20-Inch Diameter - 66-7/8-Inch Height To Blower Connect
  • Tamper-Resistant Brass Drain Valve
  • Factory-Installed Side T&P Valve
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Fuel Type:

Natural Gas

BTU Input:


Capacity (Gallons):


Energy Factor:


Diameter (Inches):


Height (Inches):


Recovery 90°F Rise:

42.6 GPH

1st Hour Delivery (Gallons):


Energy Star Rated:


Weight (lbs):

170 lbs



Vent Type:

Power Vent


6 Year (Tank Parts)

Max Altitude (Feet):


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