Whirlpool T-K1S User Manual

 

8

Follow local guidelines for the length of the 
plumbing line in order to ensure that there is 
enough water pressure for all the fixtures on the 
line.  First, calculate the effective length of the 
plumbing line by measuring the total length of pipe, 
and then adding to this 5’ for each elbow or tee in 
the line.  Use the following chart to determine the 
total number of fixture units on the line, and then 
compare with the chart at the bottom of this page 
to find the pipe diameter and water pressure 
necessary. 

Install with control valves on the inlet and outlet, 
and use removable unions or connectors to 
facilitate maintenance or service if necessary. 

 
 
 
 
 
 
 
 
 
 

If the water heater is installed in a closed water 
system; means shall be provided to control thermal 
expansion. Contact the water supplier or a local 
Plumbing Contractor on how to control this 
situation. 
Purge the water line of air, and clean the filter 
before initial operation. 

 

WARNING: 

Do not reverse the hot outlet and 

cold supply line connections to the Flash Water

 

Heater. Make sure the hot and cold lines are 
connected as in the FOR YOUR SAFETY section 
at the front of this manual. 
 

Pressure Relief Valve 

An approved pressure relief valve must be 
installed in any installation with this unit.  The 
pressure relief valve must be installed on the hot 
line out of the unit, with no check valves or control 
valves between the unit and the relief valve. It is 
recommended to install the pressure only relief 
valve 6” inches away from water flow to prolong 
the life of the Pressure relief valve. 

 
 
 
 
 
 
 
 
 

 

 
 
The Pressure only relief valve must be rated for 
150 PSI, and have a discharge capacity of 
190,000 BTU.  Connect the discharge opening of 
the relief valve to a suitable drain to prevent water 
damage should discharge occur. 
If the pressure relief valve discharges periodically, 
this may be due to thermal expansion in a closed 
water supply system. Contact the water supplier or 
local plumbing contractor on how to correct this 
situation.  
Do not plug the pressure relief valve. The line 
should have no reduced fittings or other 
restrictions and should allow for complete drainage 
of valve and line. The pressure relief valve should 
be manually operated once a year to check for 
correct operation. 
Should overheating occur or the gas supply fail to 
shut off, turn off the manual gas control valve to 
the appliance. 

Length to the End of Hot Water Line and Recommended Fixture Units 

Pipe 

Size 

Length 

100' 

200' 

300' 

400' 

100' 

200' 

300' 

400' 

100' 

200' 

300' 

400' 

3/4" 

3-12 

1-6 

1-5 

0-4 

5-17 

3-11 

2-8 

1-6 

6-20 

4-13 

3-10 

2-8 

1" 

12-25 

6-17 

5-13 

4-12 

17-36 

11-25 

8-20 

6-18 

20-39 

13-32 

10-26 

8-22 

1-1/4"  25-48 

17-32 

13-25 

12-21 

36-78 

25-52 

20-39 

18-33 

39-78 

32-74 

26-54 

22-43 

Unit 

Combination Bath / Shower 

4 

Whirlpool Bath 

4 

Shower 

2 

Lavatory 

1 

Clothes Washer 

4 

Dishwasher 

1.5 

Kitchen Sink 

1.5