Takagi T-M50 User Manual
Commercial Gas
Tankless Water Heaters
Designed specifically for commercial applications. Fully
modulating, gas-fired, tankless, water heaters with sealed
combustion (optional) and power vented flue. Can be
installed indoors, outdoors, or direct vent. Capable of
supplying hot water for domestic hot water systems
(directly or indirectly) using water storage tanks,
recirculations systems, hydronic heating systems, radiant
floor heating systems, and/or combined domestic & heating
applications (local codes dictate proper compliance).
FEATURES
HEAT EXCHANGER IS
CONSTRUCTED OF HRS35
COMMERCIAL-GRADE COPPER*
■ Stronger than standard copper
and more resilient against erosion
CONTINUOUS MAXIMUM FLOW
RATES UP TO 14.5 GPM
EASY-LINK UP TO 4 UNITS
MULTI-LINK UP TO 10 UNITS
WITH TM-MC01
COMBINED INDOOR/
OUTDOOR MODELS
AVAILABLE IN NATURAL GAS OR
PROPANE
ASME MODELS AVAILABLE
LOW NOx EMISSIONS
COMPLIES WITH LEAD FREE
STANDARDS
SAFETY FEATURES:
■ Built in Freeze Protection
■ Manual Reset Hi-Limit
(Set at 194°F)
■ Overheat Cutoff Fuse
■ Inlet and Outlet Thermistors for
Constant Temperature Monitoring
■ Air-Fuel Ratio Rod
■ GFI, Fuse, and Surge Absorber
■ Flame Sensor
*only on non-asme products
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VENTING AND COMBUSTION
■ 5” Category III Vent
■ Vertical or Horizontal Installation
■ 50’ Max Length, 5 Elbows max
(90° elbows = 5’ equivalent length)
■ Power Vent
■ Electronic Ignition - No Pilot Light
■ 5” Combustion Air Intake (with
optional kit)
OPTIONAL ACCESSORIES
■ Multi-Unit Controller, TM-MC01
(Part Number 9007675005) for
systems of 5-10 heaters
■ Remote Temperature Controller
(9007603005)
■ Direct Vent Conversion Kit
■ Pipe Cover
■ Vent Cap
■ Backflow Preventor
■ Concentric Termination Kits
WARRANTY
■ 15-year limited warranty on heat
exchanger in residential
applications
■ 10-year limited warranty on heat
exchanger in commercial
applications
■ 5-year limited warranty on all parts
T-M50
ANSI Z21.10.3
CSA 4.3
Commercial Gas
Flow Rate Vs. Temperature Rise
Flow Rate (gpm)
Temperature Rise (°F)
Flow Rate (gpm)
Pressure Loss (psi)
Above shown rate is based on single unit only
Pressure Loss
Set temperature of 145° or lower Set temperature of 150° or higher
0
25 456585 105 125145
2
4
6
8
10
12
14
16
10.0
5.0
0.0
0
20
40
15
25
0
10
10
20
30
50
5
15.0
Set temperature of 145° or lower Set temperature of 150° or higher
Tankless Water Heaters
MODEL
NUMBER
FUEL
TYPE
GAS CONSUMPTION
INPUT
MIN.
BTU/H
MAX.
BTU/H
THERMAL
EFFICIENCY
INLET GAS
PRESSURE
MIN.
in. w.c.
MAX.
in. w.c.
DIMENSIONS IN INCHES
MAX
HEIGHT WIDTH DEPTH
GPM*
VOLT AMP FLUE**
INTAKE
(OPTIONAL)
HOT/COLD
GAS
CONN.
SHIPPING
T-M50-N Natural 15,000 380,000 80% 5.0 10.5 0.5-14.5 24-7/8 25-1/4 12-1/4 120 1.48 5” O.D. 5” O.D. 1” NPT 113
T-M50-P Propane 15,000 380,000
T-M50-N ASME Natural 15,000 380,000
T-M50-P ASME Propane 15,000 380,000
All dimension in inches.
15-150 psi water pressure. 40 psi or above recommended for maximum flow.
*Current numbers based on factory testing, 0.5 GPM required for activation, 0.4 GPM required for continuous fire after initial ignition.
**Category III required
Pressure only relief valve required (Min. 380,000 BTUs. 150 PSI).
82% 8.0 14.0 0.5-14.5 24-7/8 25-1/4 12-1/4 120 1.48 5” O.D. 5” O.D. 1” NPT 113
80% 5.0 10.5 0.5-14.5 24-7/8 25-1/4 12-1/4 120 1.48 5” O.D. 5” O.D. 1” NPT 113
82% 8.0 14.0 0.5-14.5 24-7/8 25-1/4 12-1/4 120 1.48 5” O.D. 5” O.D. 1” NPT 113
CLEARANCES:
INDOOR: Top 12”, Bottom 12”, Front 24”, Back 0.5”, Sides 2”
OUTDOOR: Top 36”, Bottom 12”, Front 24”, Back 0.5”, Sides 2”
APPROX.
WEIGHT
(LBS)
The fully modulating, on-demand, gas fired tankless water heater(s) shall be Takagi Tankless Water Heater model T-M50 or T-M50-ASME, having a maximum input rating of 380,000 Btu/h
and available in NG or LP. The heater shall have 1 in. male NPT water and gas connections. The inlet gas supply pressures shall be 5.0 in. WC (min.) up to 10.5 in. WC (max.) for NG and
8.0 in. WC (min.) up to 14 in. WC (max.) for LP. The heater(s) can use an accessory temperature remote, TM-RE30/9007603005, that can be installed up to 400 ft. from the heater using 18
gauge (minimum) control wire. The temperature remote shall provide diagnostic information, fault history, and heater set temperature. The heater(s) shall operate using 120 V / 60 Hz
power source.
The heater(s) shall be vented with 5” diameter Category III vent pipe with a length not to exceed 50 ft. (equivalent), terminating horizontally or vertically. The heater(s) can be direct
vented with optional direct vent conversion kit, TM-DV50/9007669005, using 5” diameter pipe. The intake pipe may use material such as PVC, ABS, aluminum, or Category III pipe
and cannot exceed 50 ft. (equivalent) length. The outdoor installation shall use a vent cap, TM-VC50/9007677005.
The water heater(s) shall contain two separate combustion sections for built-in redundancy, each section containing a copper, fin tube heat exchanger with quick release brass or bronze
waterways. The heater(s) shall be controlled by onboard solid-state printed circuit boards which use the following factory installed components: thermistors to monitor water
temperature; flow sensors to measure flow rate; flame sensors to monitor combustion; Air-Fuel Ratio Rod to measure and adjust air input in order to maintain optimal combustion
efficiency. The heater also consists of inline fusing and surge absorbers for electrical surge protection, electronic spark igniters, aluminized stainless steel burners, hi-limit temperature
switches, modulating gas valves, dual freeze protection that will automatically fire the heater (indoor direct vent model only) and use heating blocks to protect the heat exchanger,
and overheat cutoff fuses.
The heater(s) can manifold to Easy-Link up to 4 heaters to provide additional capacity. The Easy-Link controls shall be built onto the onboard solid-state printed circuit board and does
not require external controls. The linking control wire shall be supplied with the heater. The heater(s) can use a Multi-Unit controller, TM-MC01/9007675005, to manifold 5-10 heaters.
The Easy-Link and Multi-Unit Controller shall modulate the system for the most efficient performance. The Easy-Link and Multi-Unit Controller shall rotate the priority heater every
12 hours of operation time or 100 starts for balanced duty/cycle operation.
The heater(s) shall be CSA approved for sale in the United States and Canada, have a minimum thermal efficiency of 80%, meets ASHRAE 90.1-2007, complies with Low NOx emissions
of 40 ng/J or 55 ppm, and shall be certified to NSF 5 Standards. The T-M50 ASME shall be certified by ASME with the HLW stamp.
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Head (ft)
Specification
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