40
UGT Series Manual
If the water heater is not going to be used during a period of possible freezing weather, it is recommended that
the water inside the water heater be drained.
To manually drain the water:
1. Shut off cold water supply and gas supply.
2. Turn off the temperature controller.
3. Disconnect the power to the water heater.
4. Place a container to catch the water. Remove the drain caps on
both isolation valves and open both valves above the caps (blue
and red valve handles). -OR- Open hot water drain plug at the hot
water outlet.
5. Remove water filter to drain the cold water.
Manual Draining of the Water Heater
To resume normal operation:
1. Confirm that all water drain plugs are removed, that the gas supply
is turned off, and that all taps are closed.
2. Screw in the water filter in the cold water inlet.
3. Replace the drain caps and close both isolation valves. -OR- Screw
in the hot water drain plug.
4. Open the cold water supply.
5. Open a tap and confirm that water flows, and then close.
6. Turn on the power.
7. After confirming that the temperature controller is off, turn on the
gas supply.
8. Turn on the temperature controller.
Running a low volume of water through the water heater to prevent freezing
If the temperature exceeds the ability of the water heater to freeze protect
itself, or if power is lost, the following steps may prevent the water heater
and external piping from freezing. (Units connected with EZ Connect (2
unit link) should be drained to prevent freezing if not in use.)
1. Turn the water heater off.
2. Close the gas supply valve.
3. Turn on a hot water tap to flow water about 0.1 gal/min or where the
stream is about 0.2 inches thick.
When the water heater or external piping has frozen
1. Do not operate the water heater if it or the external piping is frozen.
2. Close the gas and water valves and turn off the power.
3. Wait until the water thaws. Check by opening the water supply valve.
4. Check the water heater and the piping for leaks.
HOT
COLD
ON!
0.1 gal/min or about
0.2 inch thick
* Use a wrench or other tool
to unscrew the hot water
drain plug.
To avoid burns, wait until the equipment cools down before draining the water. The
water in the appliance will remain hot after it is turned off.
WARNING
Water
filter
Hot water
outlet
Hot water
drain plug *
Cold water
inlet
