ProLine Residential Gas Tankless Water Heaters

Residential Gas Tankless Water Heaters

American provides a full selection of natural gas and liquid propane tankless water heaters designed for continuous hot water. Choose from the ENERGY STAR® certified Adapt™ condensing line.

American Water Heaters
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Adapt®+ Premium Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt®+ Premium Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model MTHR-199X3 100
  • ENERGY STAR® certified
  • 199,000 BTU input
  • 15-year warranty
View Model
Adapt®+ Premium Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt®+ Premium Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model MTHR-180X3 100
  • ENERGY STAR® certified
  • 180,000 BTU input
  • 15-year warranty
View Model
Adapt®+ Premium Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt®+ Premium Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model MTHR-160X3 100
  • ENERGY STAR® certified
  • 160,000 BTU input
  • 15-year warranty
View Model
Adapt®+ Premium Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt®+ Premium Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater Model MTHR-199M 100
  • ENERGY STAR® certified
  • 199,000 BTU input
  • 15-year warranty
View Model
Adapt®+ Premium Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt®+ Premium Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater Model MTHR-180M 100
  • ENERGY STAR® certified
  • 180,000 BTU input
  • 15-year warranty
View Model
Adapt®+ Premium Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt®+ Premium Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater Model MTHR-160M 100
  • ENERGY STAR® certified
  • 160,000 BTU input
  • 15-year warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model MTM-199X3-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 199,000 BTU input
  • 15-year warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model MTM-180X3-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 180,000 BTU input
  • 15-year warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model MTM-160X3-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 160,000 BTU input
  • 15-year warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 140,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 140,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model MTM-140X3-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 140,000 BTU input
  • 15-year limited warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater Model MTM-199M-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 199,000 BTU input
  • 15-year warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater Model MTM-180M-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 180,000 BTU input
  • 15-year warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater Model MTM-160M-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 160,000 BTU input
  • 15-year warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 140,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 140,000 BTU Natural Gas Tankless Water Heater Model MTM-140M-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 140,000 BTU input
  • 15-year limited warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 199,000 BTU Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 199,000 BTU Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology Model MTM-199X3-P 111
  • ENERGY STAR® certified with a UEF of 0.95
  • 199,000 BTU input
  • 15-year warranty
View Model
Showing 1-15 of 132
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American water heaters are available through your local plumbing professional.
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