199,000 BTU Ultra Low-NOx w/X3 Technology Liquid Propane Outdoor Condensing Tankless Water Heater (10 GPM)

The Takagi brand has been discontinued by the manufacturer as of December 31, 2025. Suggested replacement units will be available on our website and replacement parts will continue to be available as supplies last. If you'd like any further assistance, please contact our customer service team.

(100344847) 199,000 BTU Ultra Low-NOx w/X3 Technology Liquid Propane Outdoor Condensing Tankless Water Heater (10 GPM)

The TK-540X3-PEH is well suited for residential applications. Takagi has combined water heating and treatment in a product designed to revolutionize tankless water heating. Our new condensing gas tankless line features X3® Scale Prevention Technology to last three times longer than other tankless models without X3® Technology. Complies with Ultra-Low NOx regulations. The TK-540X3-PEH utilizes commerciall-grade copper alloy for the heat exchanger tubing and are approved to work with an external recirculation pump and cross-over valve. Certified up to 10,100 ft. altitude.

Product Features

• This unit is NOT approved for installation in Manufacture Homes and is not suitable for space heating applications only
• ENERGY STAR® qualified
• X3® Scale Prevention Technology
• 15-year limited Heat Exchanger Warranty, 5-year parts warranty, 1-year labor warranty for Residential applications
• commercial-Grade Copper Heat Exchanger
• Approved to work with an external recirculation pump and cross-over valve
• Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)
• Condensing Liquid Propane outdoor model
• Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes