The compact T-KJr2U is a fully modulating, gas fired, tankless water heater perfect for residential applications. With gas inputs of 140,000 BTU, the T-KJr2 can produce enough hot water for up to two bathrooms in warmer climates.


Download T-KJr2U Manual

Download T-KJr2U Specification Sheet 


Available for indoor and outdoor installation, the T-KJr2U supplies hot water to domestic hot water systems (directly or indirectly) which can be used with storage tanks, recirculation systems, hydronic heating systems, radiant floor systems, and/or domestic & heating applications.

  • Maximum flow rate of 6.6 GPM at 35°F temperature rise (3.3 GPM at 70°F rise)
  • Energy Factor of 0.82 for NG and LPG
  • ENERGY STAR® qualified
  • Indoor model includes both a remote control and power cord as standard features
  • Outdoor model includes remote control as standard feature
  • Venting with Category III stainless steel
  • Safety features include freeze, overheat, and surge protection
  • Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)


Natural Gas Input Min. 15,000Btu   Max. 140,000Btu 
Gas Connection 3/4" NPT   
Water Connection 3/4" NPT   
Natural Gas Pressure Inlet Min. 5.5" W.C.  Max. 10.5" W.C. 
Weight 37 lbs.   
Dimensions 20-1/2" x 13-4/5" x 8-1/2"   
Ignition Electronic Ignition   
Electrical Supply AC 120V (60 Hz)   
Water Pressure Min. 15 psi   
Natural Manifold Pressure 3.2" W.C.  Max. 150 psi 

The TM-RE40 Temperature Remote Controller allows the output temperature to be adjusted beyond the factory settings, and works as a diagnostic tool for error codes.

Direct Vent Conversion Kit
The TK-TV10 direct vent conversion kit can be used to convert the tankless hot water unit from a conventional vent system to a direct vent (or sealed combustion) system.
Sidewall Vent Terminator (Hood) and Wall Thimble (4”-7”)
Sidewall Vent Terminator (Hood) and Wall Thimble (4”-7”)
Backflow Preventer & F-F Adaptor
Backflow Preventer & F-F Adaptor
Isolation Valves & Pressure Relief Valve
Isolation valves are used to isolate a unit for service. The Pressure Relief Valve is to help protect the unit and release if the pressure in the tankless water heater or hot water system exceeds 150 psi.