ProLine Residential Gas Tankless Water Heaters

Residential Gas Tankless Water Heaters

State Water Heaters presents a comprehensive lineup of natural gas and propane tankless water heaters, ensuring uninterrupted hot water supply. Select from ENERGY STAR® certified condensing models for maximum efficiency or non-condensing models for reliable performance tailored to your preferences.

State 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 STHR-199X3 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 199,000 BTU input
  • 15-year limited 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 STHR-180X3 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 180,000 BTU input
  • 15-year limited 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 STHR-160X3 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 160,000 BTU input
  • 15-year limited warranty
View Model
Adapt®+ Premium Condensing 199,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt®+ Premium Condensing 199,000 BTU Natural Gas Tankless Water Heater Model STHR-199M 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 199,000 BTU input
  • 15-year limited warranty
View Model
Adapt®+ Premium Condensing 180,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt®+ Premium Condensing 180,000 BTU Natural Gas Tankless Water Heater Model STHR-180M 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 180,000 BTU input
  • 15-year limited warranty
View Model
Adapt®+ Premium Condensing 160,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt®+ Premium Condensing 160,000 BTU Natural Gas Tankless Water Heater Model STHR-160M 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 160,000 BTU input
  • 15-year limited 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 STM-199X3-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 199,000 BTU input
  • 15-year limited 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 STM-180X3-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 180,000 BTU input
  • 15-year limited 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 STM-160X3-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 160,000 BTU input
  • 15-year limited warranty
View Model
Adapt® SC Standard Condensing 199,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt® SC Standard Condensing 199,000 BTU Natural Gas Tankless Water Heater Model STM-199M-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 199,000 BTU input
  • 15-year limited warranty
View Model
Adapt® SC Standard Condensing 180,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt® SC Standard Condensing 180,000 BTU Natural Gas Tankless Water Heater Model STM-180M-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 180,000 BTU input
  • 15-year limited warranty
View Model
Adapt® SC Standard Condensing 160,000 BTU Natural Gas Tankless Water Heater
Energy Star
Adapt® SC Standard Condensing 160,000 BTU Natural Gas Tankless Water Heater Model STM-160M-N 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 160,000 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 STM-199X3-P 111
  • ENERGY STAR® certified with a UEF of 0.95
  • 199,000 BTU Liquid Propane input
  • 15-year limited warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 180,000 BTU Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 180,000 BTU Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology Model STM-180X3-P 111
  • ENERGY STAR® certified with a UEF of 0.95
  • 180,000 BTU Liquid Propane input
  • 15-year limited warranty
View Model
Adapt® SC Standard Condensing Ultra-Low NOx 160,000 BTU Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology
Energy Star
Adapt® SC Standard Condensing Ultra-Low NOx 160,000 BTU Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology Model STM-160X3-P 111
  • ENERGY STAR® certified with a UEF of 0.95
  • 160,000 BTU Liquid Propane input
  • 15-year limited warranty
View Model
Showing 1-15 of 96
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