Takagi Flash Water Heater T-KD20 Installation Manual And Owner'S Manual Download Page 5

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Department of Energy method of testing water
heater output, the T-KD20 is rated for 250 gallons
per hour, or 4.2 GPM, at a 77

F rise above the

inlet temperature. Refer to the following chart of
typical household flow rates to determine what the
T-KD20 can do in a household application.

Remember that for bathing, cold water will be
mixed for a comfortable temperature, increasing
the flow output rate.

Freeze Prevention

This unit comes equipped with heaters that
discourage the unit from freezing. For this freeze
prevention system to operate there has to be
electrical power to the unit.
The freeze prevention devices will not work if the
electrical power source is disconnected.
The unit has been rated for temperatures down to
5º F (-15º C) in a wind free environment. The wind
chill factor will cause the unit to freeze at
temperatures even 5º F (-15º C) in ambient
temperature, even if the unit is installed indoors.
For indoor installation in areas where the
temperature will be well below freezing for
extended periods of time, use the thermostat
extension cable to extend the internal thermostat
to the outdoors, and install a TK-TV03 backflow
prevention kit so that cold air will not backflow into
the flue and cause the unit to freeze. Do not install
the water heater in an area with extremely cold
weather. This will void your warranty and Takagi
Industrial Co. USA Inc. will not be responsible for
any damage that occurs.

WARNING

: The pipe heaters are located on the

Flash Water Heater only. Any hot or cold water
pipes located outside of the unit will not be
protected. Properly protect and insulate these
pipes from freezing.

If the heater will not be in use for a long period of
time or if the temperatures will drop below 5º F (-
15º C) with the wind chill factor, turn off heater and
drain the unit of water. This applies to indoor and
outdoor installations. This will keep the unit from
freezing and being damaged.

Follow these instructions carefully:

1. Turn off the power supply to the Flash Water

Heater.

2. Close manual gas control valve.
3. Close manual water shut off valve.
4. Open all hot water taps in the house.

(Bathroom, kitchen, laundry room, etc.). When
the water flow has ceased, close all hot water
taps.

5. Have a bucket or pan ready to catch the water

from the unit’s drain plugs. Remove the drain
plugs to drain the water out of the unit.

6.  Let drain for 5 minutes.
7.  Securely screw the drain plugs back into place.

Follow these steps when it is again safe to use the
water heater:

1.  Make sure all hot water taps are closed and

the drain plugs are securely attached.

2. Purge the water line of debris.
3. Open manual water control valve located on

the water supply line.

4. Open all the hot water taps to verify water

flows to the taps. Close hot water taps.

5. Open manual gas control valve located on the

gas supply line.

6. Turn on the power supply to the Flash Water

Heater.

Household Flow Rates

Appliance / Use

Flow Rate