TK-540P-NIH - 199,000 BTU Natural Gas Condensing Tankless Water Heater

TK-540P-NIH  (199,000 BTU Natural Gas Ultra Low NOx Indoor Condensing Tankless Water Heater with Integrated Water Saving Recirculation Pump)

TK-540P-NIH series 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-NIH indoor 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/cooler climates and a 4 bath home in southern/warmer climates. It is built with commercial grade materials like marine-grade 316L stainless steel giving it an industry-leading warranty.

Number of showers this unit can handle, depending on ground water temperature.

Warmer Climates 


Cooler Climates 

• ENERGY STAR® qualified
• Integrated/Built In Water Saving 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 SCAQMD 1146.2 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
• Common Vent up to 8 units
• Condensing Indoor model
• Safety features include Air-Fuel ratio (AFR) sensor, freeze protection, overheat cut-off fuse, exhaust & water temperature safety control, and troubleshooting diagnostic codes
• 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