Flow; Freeze Protection System - Takagi T-M50 Installation Manual And Owner's Manual

• The flow rate through the water heater is limited to a maximum of 14.5 GPM.
• The temperature setting, along with the supply temperature of the water will determine the
flow rate output of the unit.
• Please refer to the temperature vs. gallons per minute chart on p.51 to determine the likely
flow rates based on your local ground water temperature and your desired outlet water
temperature combination.
• Based on the United States Department of
Energy method of testing water heater output,
the water heater is rated for 474 gallons per
hour (GPH) or 7.9 gallons per minute (GPM)
for Natural Gas, and 504 GPH or 8.4 GPM for
Liquid Propane, when raising the water
temperature by 77°F (from 58°F to 135°F).
• Refer to the chart on the right for typical
household plumbing fixture flow rates to
determine what the water heater can do in a
household application.
• This unit comes equipped with heating blocks to protect it against damages associated with
freezing.
• For this freeze protection system to operate, there has to be electrical power to the unit.
Damage to the heat exchanger caused by freezing temperatures due to power loss is not
covered under the warranty. In cases where power losses can occur, consider the use of a
backup power supply.
• The freeze protection system will activate when the surrounding and/or outside temperatures
drop below 36.5°F (2.5°C).
• In any areas subject to freezing temperatures, the manufacturer highly recommends
installing the unit indoors. In such an installation, freezing issues can only occur if cold air
enters through the venting into the heat exchanger, whether by negative pressures within the
installation location or by strong outside winds. It is the installer's responsibility to be aware
of these issues and take all preventative measures. The manufacturer will not be responsible
for any damage to the heat exchanger as a result of freezing.
• The manufacturer also highly recommends the use of a backflow preventer (sold separately)
to minimize the amount of cold air entering through the exhaust venting when the water
heater is off.
• If you will not be using your heater for a long period of time:
1. Completely drain the water out of the unit. Refer to p. 34.
2. Disconnect power to your heater.
This will keep your unit from freezing and being damaged.
CAUTION: Only pipes within the water heater are protected by the freeze protection
system. Any water pipes (hot or cold) located outside the unit will not be protected.
Properly protect and insulate these pipes from freezing.

FLOW

FREEZE PROTECTION SYSTEM

Appliance / Use
Lavatory Faucet
Bath Tub
Shower
Kitchen Sink
Dishwasher
Washing Machine
Taken from UPC 2006
- 32 -
Household Flow Rates
Flow Rate (GPM)
1.0
4.0 – 10.0
2.0
1.5
1.5
4.0