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Installation Manual
Bosch Tronic 5000T Electric Water Heaters - BTC 724001301 A (10.2021)
11 Maintenance
WARNING: MODIFICATION, TAMPERING
Tampering with the thermostat, heater elements,
electrical connections or temperature and pressure
relief valve-is dangerous and may result in serious injury
or death. Tampering voids all warranties. Only properly
trained, qualified service personnel should service these
components. Do not attempt to modify or change this water
heater in anyway.
Conversion or rewiring by unauthorized persons will void
the warranty, can nullify the underwriter's laboratories (UL)
certification of the water heater and could result in property
damage or personal injury for which the manufacturer
cannot be responsible.
CAUTION: PERSONAL INJURY, PRODUCT DAMAGE
Do not use this appliance if any part has been under water.
Immediately call a qualifi ed service technician to inspect
the appliance and to replace any part of the control system
which has been under water.
Proper preventative maintenance will signifi cantly extend the life of the heater. It is
recommended that an annual inspection of the operating controls, heating element
and wiring be made by service personnel qualifi ed.
To obtain service on your water heater when adjustment, repair, or routine
maintenance is required it is suggested that you fi rst contact your installer,
plumbing contractor or previously agreed upon service agency.
11.1 Draining Heater
WARNING: SCALD HAZARD
The water drained from the tank may be hot enough to
present a SCALD HAZARD and should be directed to a
suitable drain to prevent injury or damage.
NOTICE: PRODUCT DAMAGE
When draining the water heater, make sure that the power
source to the water heater is shut off before draining water.
and completely fi ll with water before reenergizing.
Drain a few quarts of water to fl ush out accumulated sediment after the fi rst 6
months then annually thereafter.
Foreign material can wash in and unless the water supply is naturally soft (0 to 5
grains hardness), scale or lime deposits will accumulate in the tank. Hard water
scale precipitates at an increasingly high rate in proportion to an increase in water
temperature.
Failure of the tank or heating elements due to accumulated deposits does not fall
within the scope of the warranty.
It is recommended that a few quarts of water be drained from the heater. This will
fl ush sediment deposits from the bottom of the heater and lengthen the heater’s
service life.
Turn off power to the heater during fl ushing operation, so the elements will not be
damaged.
To fl ush the tank, attach a hose to the fi eld installed drain valve. Close the cold
water supply line shut-off valve. Open the drain valve and hot water faucet(s) to
vent heater while draining. Direct the fl ow of water to a drain or bucket where it will
not cause damage.
Flush until water runs clear to complete this operation. Close drain valve and
reopen the supply line shut-off valve. Close the hot water faucet(s) once all air has
been bled from the system
If periodic draining of this unit is desired, drain valve can be turned slightly
clockwise with a wrench to allow easier connection of the hose.
Make sure water heater is completely fi lled with water before reenergizing.
11.2 Test the TPR Valve
Test the operation of the relief valve after fi lling and pressurizing the system. Place
a bucket under the pipe connected to the temperature-pressure-relief (TPR) valve
on the top or side of the tank. (This valve opens if the tank pressure gets too high.)
Lift the lever. Make sure the valve discharges freely.
Figure 8
Test temperature-pressure-relief (TPR) valve at least once annually to ensure the
waterway is clear.
If the valve fails to operate correctly, immediately replace with a new properly rated
relief valve.
