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Note: ProMax name is now ProLine.

The ProLine® Ultra-Low NOx Direct Vent residential gas water heaters offer horizontal or vertical venting options in an FVIR solution to reduce the risk of accidental fires involving flammable vapors.

Featuring a 40-gallon tank and a 36,000 BTU gas burner, the GDNL-40L-100 Direct Vent Ultra-Low NOx delivers a first hour rating of 59 gallons and a recovery rate of 39 gallons per hour. With an 0.62 Energy Factor, this water heater is not ENERGY STAR® qualified. It carries a 6-year limited tank warranty, and meets Ultra-Low NOx emission requirements.

  • Flammable vapor resistant/direct Vent sealed combustion system - Thru-the-Wall/Thru-the-Roof venting of combustion products
  • Air for combustion is drawn from outside the building
  • Fused ceramic tank shield - A tough, thick, durable coat of blue ceramic is fused to the tank's interior surfaces at 1600°F, forming a corrosion-resistant lining for years of dependable protection and use
  • Non-CFC foam insulation - The tank is surrounded by a thick coat of non-CFC polyurethane foam to trap heat inside the tank, saving energy
  • Durable, ultra low NOx burner construction
  • Combination thermostat/ECO - With factory-preset pressure regulator and built-in millivolt-powered energy cut-off for overheat protection
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Fuel Type:

Natural Gas

Capacity (Gallons):


BTU Input:


Energy Factor:


Diameter (Inches):


Height (Inches):


Recovery 90°F Rise:

39 GPH

Energy Star Rated:


Weight (lbs):

179 lbs



Vent Type:

Direct Vent


6 Year (Tank Parts)

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