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7.3 Filling the Heater
1. Make certain any drain valves in the system are completely closed.
2. Open the shut-off valve in the cold water supply line.
3. Open the hot water faucets to allow air to vent from the heater and piping.
4. Allow suffi cient time for the heater to completely fi ll with water.
5. Check for and repair any leaks.
NOTICE: PRODUCT DAMAGE, PROPERTY DAMAGE
When filling the water heater, open a hot water tap to release
air in the heating canister and piping. The heating canister
must be full of water before the heater is turned on. Failure
to ensure the water heater is full before turning it on could
result in damage to the water heater and other property
damages. Such damages ARE NOT covered by water heater
warranty.
7.4 Electrical Connection
DANGER: HAZARDOUS VOLTAGE
Failure to disconnect the power from the water heater
before attempting to install or repair it will result in property
damage, severe personal injury, or death.
WARNING: PERSONAL INJURY, PROPERTY DAMAGE
All wiring (wire gauge) as well as circuit protection
(breakers) must comply with the National Electrical Code
(NEC) in the USA or the Canadian Electrical Code (CEC)
in Canada, and should be done by a qualifi ed licensed
electrician or the local electric utility.
WARNING: ELECTRIC SHOCK HAZARD
Be sure to ground the water heater. Failure to do so could
result in property damage, severe personal injury, or death.
NOTICE: PRODUCT DAMAGE, PROPERTY DAMAGE
The water heater must be full of water before the power is
turned on. The heating element will be damaged if energized
for even a short time while heating canister is dry. Failures
due to "dry-firing" ARE NOT covered by warranty.
T his water heater must be hard wired to the correct breaker size with the
appropriate wire gauge.
Bosch Tronic TR4000C Electric Tankless Water Heaters- BTC 722203301 A (08.2022)
1. Make sure power to the unit is shut off by means of the dedicated circuit
breakers on the main electrical panel.
2. Connect the appropriate AWG wire power cable for the model water heater to
the terminal block.
TR4000C-3
Figure 11
3. Make secure, appropriate wiring connections to the water heater per the
National Electric Code.
4. The unit must be grounded.
5. Secure the water heater cover once wiring connections have been made.
6. When the water heater is not within sight of the electrical circuit breakers, a
circuit breaker lockout or additionallocal means of disconnection for all non-
grounded conductors must be provided that is within sight of the appliance
(Ref. NEC 422.31).
I t is recommended that the water heater electrical connections be tested
once a year by a qualifi ed technician.
7. After wiring is complete, replace and secure the front cover of the water
heater.
Installation Manual
TR4000C-6
TR4000C-10
TR4000C-8
TR4000C-13
L2
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