A.O. Smith ProMax Side Loop Gas WH

A.O. Smith ProMax Side Loop

Gas Water Heater


Our ProMax® specialty vent gas water heaters can be installed almost anywhere in your home because they can vent up to 40 feet. Our direct-vent models feature two-pipe combustion systems that draw clean air from outside the home, eliminating any worries about indoor ventilation. 

  • Side-mounting recirculating taps for combination space heating/water heating applications (such as air handlers).
  • Features C3 Technology™ that protects against accidental ignition of flammable vapors.
  • "Environmentally-Friendly" Green Choice® gas burner reduces NOx emissions by 33% compared to standard burners.
  • Piezo igniter for easy “no match” pilot ignition.

Tech Specs


Gallon Capacity:

40 - 74

Recovery Rise @ 90°F (Gallons):

41 - 81

Energy Factor: 0.57 - 0.63

Input BTU/HR Natural Gas:

40,000 or 75,100


Height (Inches):

61 - 65

Weight (Lbs):

138 - 275