The T-M50 is a fully modulating, gas fired, tankless water heater perfect for heavy-duty commercial applications. With gas inputs of 380,000 BTU, the T-M50 can produce enough hot water for six bathrooms in warmer climates. An ASME version is also available.


Download T-M50/T-M50 ASME Manual

Download T-M50 Specification Sheet

Download T-M50 ASME Specification Sheet


Available for indoor and outdoor installation, the T-M50 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 14.5 GPM at 35°F temperature rise (8.7 GPM at 70°F rise)

  • Thermal Efficiency of 80.2% for NG and 82.4% for LPG

  • Heat exchanger utilizes HRS35 commercial-grade copper alloy for 25 times better heat transfer than stainless steel*

  • Dual heat exchanger design provides redundancy for added reliability ? an industry exclusive!

  • Indoor model includes both a remote control and power cord as standard features

  • Outdoor model includes remote control as standard feature

  • NSF certified for commercial applications

  • Internal pump control port

  • Easy-Link up to four units without an additional remote control

  • Multi-Link up to 20 units

  • Venting with Category III stainless steel

  • Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes

*ASME version uses C1220 copper

Natural Gas Input Min. 15,000 Btu  Max. 380,000 
LPG Input Min. 15,000 Btu  Max. 380,000 
Gas Connection 1" NPT   
Water Connection 1" NPT   
Natural Gas Pressure Inlet Min. 5.0" W.C.  Max. 10.5" W.C. 
LP Gas Pressure Inlet Min. 8.0" W.C.  Max. 14" W.C. 
Weight 112 lbs   
Dimensions 25.3" X 24.8" X 11.8"   
Ignition Electronic Ignition   
Electrical Supply AC 120V (60 Hz)   
Water Pressure Min. 15 PSI  Max. 150 PSI 
Outdoor Ventilation Cap
The TM-VC50 Outdoor ventilation Cap is used when the tankless hot water unit is to be installed outdoors.  Installed over the flue collar, the cap prevents debris from entering the unit.
Temperature Remote Control
The TM-RE30 Temperature Remote Controller allows the output temperature to be adjusted beyond the factory settings, and works as a diagnostic tool for error codes.
Pipe Cover (optional)

The TM-PC50 Pipe cover is designed to be attached directly to the bottom side of the unit to provide a cover for the pipe connection entry.


Multi Unit Controller (Multi Unit System)

The TM-MC01 Multi system controller is capable of handling up to 20 units at one time.  It also works as a diagnostic tool that provides error codes.
Lead free Isolation Valves & Pressure Relief Valve
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.

Direct Vent Conversion Kit (optional)
The TM-DV50 Direct Vent Conversion Kit (optional) can be used to convert the tankless hot water unit from a conventional vent system to a direct vent (or sealed combustion) system.
Exhaust Backflow Prevention Kit
The TM-BF50 prevents cold air from entering vent and causing heat exchanger to freeze.