199,000 BTU Ultra Low-NOx Natural Gas 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.

Rebates:
This product qualifies for a federal tax rebate of up to $600. Federal Rebate click for more info

In addition to the federal rebate, you may also be eligible for rebates from your local utility company and state. Search your zip code in the link below for information about local rebate programs that may apply to you. Takagi Rebate Center

Note: Pressure Relief Valve is not included and has to to be purchased separately in order to properly install unit.

The TK-540P-NEH heater integrates a recirculation pump to provide instant hot water in residential applications with dedicated recirculation lines. The pump is easily controlled with a simple user interface and multiple pump settings allow you to customize pump operation to meet your needs while maximizing heater efficiency. As part of the high efficiency tankless family, the 540P series provides endless hot water while being environmentally friendly.

The TK-540P-NEH outdoor tankless water heater uses up to 199,000 BTU/hr of natural gas to deliver an endless supply of hot water for a 3 bath home in northern climates and a 4 bath home in southern climates. It is built with commercial grade materials like marine-grade 316L stainless steel giving it an industry-leading warranty.

Features:

• This unit is NOT approved for installation in Manufacture Homes and is not suitable for space heating applications only.
• ENERGY STAR® qualified
• 15-year limited Heat Exchanger Warranty, 5-year parts warranty, 1-year labor warranty for Residential applications
• 6-year limited Heat Exchanger Warranty, 5-year parts warranty, 1-year labor warranty for Commercial applications
• Integrated Recirculation Pump - 1/2" pipe - 100'; 3/4" pipe - 500'
• Primary heat exchanger is constructed of a commercial grade copper that is more resilient to erosion.
• Secondary heat exchanger is made of type 316L stainless steel to protect against corrosion.
• Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)
• Easy-Link with up to three other T-H3 units to increase flow capacity
• Condensing Outdoor model
• Safety features include Air-Fuel ratio (AFR) sensor, freeze protection, overheat cut-off fuse, exhaust & water temperature safety control, and troubleshooting diagnostic codes