Residential Gas Tankless Water Heaters

Residential Gas Tankless Water Heaters

Reliance offers a complete line of natural gas and liquid propane tankless water heaters for continuous hot water needs. Choose from condensing models that are ENERGY STAR® certified or non-condensing models.
Reliance Water Heaters
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Premium Condensing 199000-BTU Tankless Water Heater with X3® Scale Prevention
Energy Star
Premium Condensing 199000-BTU Tankless Water Heater with X3® Scale Prevention Model RTHR-199X3 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 15-year warranty on heat exchanger
  • X3® Scale Prevention Technology—Maintains like-new performance
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Premium Condensing 180000-BTU Tankless Water Heater with X3® Scale Prevention
Energy Star
Premium Condensing 180000-BTU Tankless Water Heater with X3® Scale Prevention Model RTHR-180X3 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 15-year warranty on heat exchanger
  • X3® Scale Prevention Technology—Maintains like-new performance longer, extends life up to 3x longer*
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Premium Condensing 160000-BTU Tankless Water Heater with X3® Scale Prevention
Energy Star
Premium Condensing 160000-BTU Tankless Water Heater with X3® Scale Prevention Model RTHR-160X3 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 15-year warranty on heat exchanger
  • X3® Scale Prevention Technology—Maintains like-new performance longer
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Premium Condensing 199000-BTU Tankless Water Heater
Energy Star
Premium Condensing 199000-BTU Tankless Water Heater Model RTHR-199M 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 15-year warranty on heat exchanger
  • Add X3® Scale Prevention with bypass cartridge to maintain like-new performance (sold separately)
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Premium Condensing 180000-BTU Tankless Water Heater
Energy Star
Premium Condensing 180000-BTU Tankless Water Heater Model RTHR-180M 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 15-year warranty on heat exchanger
  • Add X3® Scale Prevention with bypass cartridge to maintain like-new performance (sold separately)
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Premium Condensing 160000-BTU Tankless Water Heater
Energy Star
Premium Condensing 160000-BTU Tankless Water Heater Model RTHR-160M 100
  • ENERGY STAR® certified with a UEF of 0.95
  • 15-year warranty on heat exchanger
  • Add X3® Scale Prevention with bypass cartridge to maintain like-new performance (sold separately)
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Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention
Energy Star
Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Model RTM-199X3-N 100
  • ENERGY STAR® Certified with a UEF of 0.95
  • Delivers up to 10.5 GPM maximum flow rate
  • 15-year heat exchanger warranty
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Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention
Energy Star
Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Model RTM-180X3-N 100
  • ENERGY STAR® Certified with a UEF of 0.95
  • Delivers up to 10.5 GPM maximum flow rate
  • 15-year heat exchanger warranty
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Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention
Energy Star
Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Model RTM-160X3-N 100
  • ENERGY STAR® Certified with a UEF of 0.95
  • Delivers up to 10.5 GPM maximum flow rate
  • 15-year heat exchanger warranty
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Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater
Energy Star
Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater Model RTM-199M-N 100
  • ENERGY STAR® Certified with a UEF of 0.95
  • Delivers up to 10.5 GPM maximum flow rate
  • 15-year heat exchanger warranty
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Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater
Energy Star
Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater Model RTM-180M-N 100
  • ENERGY STAR® Certified with a UEF of 0.95
  • Delivers up to 10.5 GPM maximum flow rate
  • 15-year heat exchanger warranty
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Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater
Energy Star
Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater Model RTM-160M-N 100
  • ENERGY STAR® Certified with a UEF of 0.95
  • Delivers up to 10.5 GPM maximum flow rate
  • 15-year heat exchanger warranty
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Non-Condensing Concentric Vent Indoor 199,000 BTU Natural Gas/Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology
Non-Condensing Concentric Vent Indoor 199,000 BTU Natural Gas/Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology Model TS-510CX3 110
  • 15-year warranty on heat exchanger; 5-year limited warranty on parts for residential applications
  • X3® Scale Prevention Technology
  • Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)
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Non-Condensing Concentric Vent Indoor 190,000 BTU Natural Gas/Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology
Non-Condensing Concentric Vent Indoor 190,000 BTU Natural Gas/Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology Model TS-310CX3 110
  • 15-year warranty on heat exchanger; 5-year limited warranty on parts for residential applications
  • X3® Scale Prevention Technology
  • Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)
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Non-Condensing Concentric Vent Indoor 199,000 BTU Natural Gas/Liquid Propane Tankless Water Heater
Non-Condensing Concentric Vent Indoor 199,000 BTU Natural Gas/Liquid Propane Tankless Water Heater Model TS-510C-GI 110
  • 15-year warranty on heat exchanger
  • Maximum flow rate of 10 GPM at 35°F temperature rise
  • Field convertible natural gas to propane (conversion kit included)
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Showing 1-15 of 50
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