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GT-540X3-NEH - Condensing Ultra-Low NOx Outdoor 199,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-540X3-NEH - Condensing Ultra-Low NOx Outdoor 199,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-540X3-PEH - Condensing Ultra-Low NOx Outdoor 199,000 BTU Propane Tankless Water Heater with X3 Scale Prevention Technology

GT-540X3-PEH - Condensing Ultra-Low NOx Outdoor 199,000 BTU Propane Tankless Water Heater with X3 Scale Prevention Technology

GT-540X3-NIH - Condensing Ultra-Low NOx Indoor 199,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-540X3-NIH - Condensing Ultra-Low NOx Indoor 199,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-540X3-PIH - Condensing Ultra-Low NOx Indoor 199,000 BTU Propane Tankless Water Heater with X3 Scale Prevention Technology

GT-540X3-PIH - Condensing Ultra-Low NOx Indoor 199,000 BTU Propane Tankless Water Heater with X3 Scale Prevention Technology

GT-340X3-NEH - Condensing Ultra-Low NOx Outdoor 180,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-340X3-NEH - Condensing Ultra-Low NOx Outdoor 180,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-340X3-PEH - Condensing Ultra-Low NOx Outdoor 180,000 BTU Propane Tankless Water Heater with X3 Scale Prevention Technology

GT-340X3-PEH - Condensing Ultra-Low NOx Outdoor 180,000 BTU Propane Tankless Water Heater with X3 Scale Prevention Technology

GT-340X3-NIH - Condensing Ultra-Low NOx Indoor 180,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-340X3-NIH - Condensing Ultra-Low NOx Indoor 180,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-340X3-PIH - Condensing Ultra-Low NOx Indoor 180,000 BTU Propane Tankless Water Heater with X3 Scale Prevention Technology

GT-340X3-PIH - Condensing Ultra-Low NOx Indoor 180,000 BTU Propane Tankless Water Heater with X3 Scale Prevention Technology

GT-240X3-NEH - Condensing Ultra-Low NOx Outdoor 160,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

GT-240X3-NEH - Condensing Ultra-Low NOx Outdoor 160,000 BTU Natural Gas Tankless Water Heater with X3 Scale Prevention Technology

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