Takagi T-H3M-IN/OS - Manual (Page 40)

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Page
FLOW
• This water heater comes equipped with heating blocks to protect it against damage associated with
freezing
• For this freeze protection system to operate, there has to be electrical power to the water heater
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 freeze protection thermostat senses temperatures
at 365 °F (25 °C) or lower
• For the 140 Indoor (T-H3M-DV) model:
• In any areas subject to freezing temperatures, the manufacturer highly recommends an indoor
installation with an indoor model 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
• 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
• It is the installer’s responsibility to be aware of freezing issues and take all preventative measures The
manufacturer will not be responsible for any damage to the heat exchanger as a result of freezing
• If you will not be using your heater for a long period of time:
1. Completely drain the water out of the water heater Refer to p 41
2. Disconnect power to your heater
This will keep your water heater from freezing and being damaged
Only pipes within the water heater are protected by the freeze protection
system Any water pipes (hot or cold) located outside the water heate r will not
be protected Properly protect and insulate these pipes from freezing
CAUTION
FREEZE PROTECTION SYSTEM
Appliance/Use
Flow rate
GPM (US) L/min
Lavatory Faucet 10 38
Bath Tub 40 – 100 152 - 378
Shower 20 75
Kitchen Sink 15 56
Dishwasher 15 56
Washing machine 40 152
Household Flow Rates
Taken from UPC 2006
• The flow rate through the water heater is limited to
a maximum of 70 GPM (265 L/min)
• The temperature setting, along with the supply
temperature of the water will determine the flow
rate output of the water heater
• Please refer to the temperature vs gallons per
minute charts on p 54 to determine the likely flow
rates based on your local ground water temperature
and your desired outlet water temperature
• Refer to the table to the top right for typical
household plumbing fixture flow rates to determine
what the water heater can do in a household
application
• Based on the United States Department of Energy
method of testing water heater output, the water
heater is rated for gallons per minute (GPM) (liters
per minute (L/min)) for Natural Gas and Propane,
when raising the water temperature by 77 °F
(43 °C) (from 58 °F to 135 °F (14 °C to 57 °C))
See the chart on the right
Unit: GPM (L/min)
Model Flow rate
140 (T-H3M)
Indoor
30 (112)
Outdoor
Normal Operation
Owner's Guide