Whirlpool T-K1S User Manual

 

4

the flow charts on the last page of this manual to 
determine the possible outlet temperature and flow 
rate combinations. Based on the United States 
Department of Energy method of testing water 
heater output, the T-K1S is rated for 242 gallons 
per hour, or 4.0 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-K1S can do in a household application. 

 

Remember that for bathing, cold water will be 
mixed for a comfortable

 

temperature, increasing 

the flow output rate. 

 

 

 

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 above 
5º F (-15º C), 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 relocate the internal thermostat 
located on the fan motor to the outdoors. This will 
sense the ambient air temperature and turn the 
internal heater blocks on to prevent the heat 
exchanger from freezing. 
For further protection 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. 

: 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 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. 

 

Appliance / Use 

(GPM) 

Lavatory Faucet 

1.0 

Bath Tub 

4.0 

Shower 

2.0 

Kitchen Sink 

1.5 

Dishwasher 

1.5 

Washing Machine 

2.0 

Taken from UPC 1997