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Takagi TM-1 Technical Specifications

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Technical Specs of the T-M1 Natural Gas LP Gas
Input BTU Rate Min 25,000 - Max 235,000 BTU Min 25,000 - Max 225,000 BTU
Thermal Efficiency Max 82.3% Max 84.7%
Energy Factor .81 .84
First Hour Rating (DOE) 300 GPH
Gas Connection 3/4" NPT
Water Connection 3/4" NPT
Water Pressure Min. 15 PSI, Max 150 PSI
Gas Pressure Min 5" wc, Max 10.5" wc Min 11" wc, Max 14" wc
Combustion Fan Assisted
Ignition Electronic Ignition
Electrical Supply 120 Volts / 0.8 Amps
Water Flow Rate Min .75 GPM, Max 9.6 GPM
Vent 4 inch round power vent
Flow Rates
(50 degree Input Water Assumed)
90°F rise / 4.3 gallons per minute
80°F rise / 4.9 gallons per minute
70°F rise / 5.5 gallons per minute
60°F rise / 6.5 gallons per minute
55°F rise / 7.0 gallons per minute
50°F rise / 7.6 gallons per minute
40°F rise / 9.6 gallons per minute
Installation Indoor or Outdoor


  • Takagi TM1 Required clearances for OUTDOOR INSTALLATION
Takagi T-M1 OUTDOOR INSTALLATION
TOP 36"
FRONT 24" (maintenance space)
BACK 1"
PIPING SIDE 12" (bottom)
SIDE 2"


  • Takagi TM1 Required clearances for INDOOR INSTALLATION
Takagi TM1 INDOOR INSTALLATION
TOP 12"
FRONT 24" (maintenance space)
BACK 1"
PIPING SIDE 12" (bottom)
SIDE 2"


  • Gas & Venting for the Takagi TM1 Gas Water Heater
It is very important to have the proper size gas line. See the Takagi TM-1 manual for more information on pipe size or contact your local gas company or contractor.

Gas 3/4" copper pipe 7/8" copper pipe 1" copper pipe
Liquid Propane 15 feet 40 feet  
Natural Gas 15 feet   45 feet
Venting
Min. Diameter
Max. Vertical or Horizontal run Max. number of elbows Rule
4 inches 35 feet 3 For each elbow, deduct 5 feet from max. vent length


  • Dimensions of the Takagi TM1
Height Width Depth Weight
24" 18" 9" 70 lbs.(shipping weight)


  • Combustion Air Required (Indoor Installations) Takagi TM1
In order to ensure an adequate supply of combustion air, the National Fuel Gas Code requires that any conventional vented gas appliance be installed in a room with a minimum volume of 50 cubic feet per 1,000 Btu/hr rated input. The following is the minimum size of open space in which the TM1 may be installed in compliance with this requirement:

Model Volume Area with an 8' ceiling
TM1 11,750 cubic feet 1,475 square feet


If the T-M1 Takagi Tanless Water heater is installed in an area smaller than indicated above, then the installer must make special provisions for combustion air in the form of two openings, each one within 12" of the top and 12" of the bottom of the space, having a total free area of 1 square inch per 1,000 Btu/hr of rated input if the air is taken from inside the house (two 16" x 16" openings). This requirement reduces to 1 square inch per 4,000 Btu/hr if the air is taken from the outside (two 6.5" x 6.5" openings).

Note: This calculation assumes normal rates of "infiltration" of outside air. A super-insulated, super-tight space/building may require outside air for the T-M1 even though the volume/area of the space meets this application.

Caution: In addition to the above, the T-M1 hot water heater must be properly vented to ensure safe and efficient operation.


  • Output Temperature Ratings of the Takagi TM1
The T-M1 is factory preset at 122°. You can change the output temperature with the internal dipswitches to 113°, 122°, 140° or 182°. If you want to use any other temperatures than this you can purchase the optional Remote Control Temperature that will allow the T-M1 to have output temperatures from 95° to 180°.

Please Note: Hot Water Heater Temperatures over 125°F can cause severe burns instantly or death from scalding. Children, disabled and elderly are at the highest risk of being scaled. Feel water temperature before bathing or showering.


For more information download a
Takagi T-M1 installation manual in pdf format.
Also see all water heater manuals from this link


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