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Installation Manual
Bosch Tronic TR4000C Electric Tankless Water Heaters - BTC 722203301 A (08.2022)
National Plumbing Codes require a drain pan for any water heater installation.
Failure to install one is the sole responsibility of owner and/or installer. Reference
UPC 2000 (Uniform Plumbing Code) Section 510 - Protection from Damage or IPC
200 (International Plumbing code) Section 504 - Safety Devices.
7.2.2 Check Valve
The pre-installed check valve is a secondary safety device to prevent inlet pressure
exceeding 123 PSI and back-fl ow of water in case of a water outage. Please do not
remove or alter it to ensure safe operation. Installer must add drainage to the port
according to National Plumbing Code.
7.2.3 Installation Example
This drawing is meant to demonstrate system piping only.
Figure 10
SHUT-OFF VALVE
HOT WATER OUTLET
BALL VALVE
CHECK VALVE
AUTOMATIC WATER
UNION
MIXING VALVE
(IF REQUIRED BY
LOCAL CODE)
PRESSURE
RELIEF (IF REQUIRED BY
LOCAL CODE)
COLD WATER INLET
CATCH
PAN
DRAIN
WATER LEAK
DETECTION
SENSOR
UNION
CHECK
VALVE
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