Service bulletin
Winterizing and freeze prevention
TWH-G2-06
| 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO
Introduction
Please note that installation instructions state that the water
heater must not be installed in a location where it may be
exposed to freezing temperatures. If the heater must be left in a
space which is likely to experience freezing temperatures (less
than 36° F), all water must be drained from the heater. If precau-
tions are not taken, resulting damage will not be covered under
the warranty.
NOTE: Use of agents like anti-freeze is not recommended as they
may cause damage to the water heater’s internal components.
Tools needed:
Bucket
Adjustable
wrench
Air compressor/compressed air
Preparation
1. Turn on/off switch on the water heater to the off (O) position
and unplug power supply cord. The display should be blank.
2. Shut off gas supply to heater.
3. Shut off the water supply to the water heater using installer
supplied shutoff valve.
4. Open hot water taps to drain and relieve pressure from the
plumbing system. If water continues to
fl
ow after 5 minutes, a
plumbing crossover is present and must be corrected before
proceeding.
5. Disconnect inlet and outlet water pipes from the water heater.
Place a small bucket underneath the water heater to catch
residual water remaining inside the water heater. Save washers
for future use.
6. Using an air compressor, blow short bursts of air through the
inlet water connection until there is no water present coming
through the outlet water connection of the heater.
7. Reconnect water
fi
ttings and return heater to service when
danger of freezing has past.
