Time to severe scalding
120 °F (48 °C)
longer than 5 minutes
125 °F (51 °C)
1.5 to 2 minutes
130 °F (54 °C)
approx. 30 seconds
135 °F (57 °C)
approx. 10 seconds
140 °F (60 °C)
less than 5 seconds
145 °F (62 °C)
less than 3 seconds
150 °F (65 °C)
approx. 1.5 seconds
155 °F (68 °C)
approx. 1 second
1) Source: Moritz, A.R. and Henriques, F.C., Jr. (1947).
Studies of thermal injury. II. The relative importance of
time and surface temperature in the causation of
cutaneous burns, Am J of Pathol, 23, 695-720.
Approximate time-temperature relationship until
there is a risk of scalding
This product can expose you to chemicals including lead, which
is known to the State of California to cause cancer and birth
defects or other reproductive harm. For more information go to
BOSCH water heater complies with the State of California Lead
Key Pad interface control.
High power pre-mix compact burner with low NOx
Modulating Gas Valve with constant gas:air ratio control.
Modulating water valve for improved comfort and
High quality materials for long working life
Copper heat exchanger.
High efficiency Ceramat Burner.
Compact space saver: mounts on a wall with a supplied
Easily removable one-piece cover.
On/Off and Temperature control switches.
940 ES – 6 720 644 930 (2019/09)
Note: The freeze prevention kit is designed to provide
protection for the water heater down to approximately 5°F for
short term conditions only. It will not protect the appliance in
areas where the temperature is routinely expected to be below
- The freeze prevention kit will not protect plumbing outside the
appliance from freezing. Precautions should be taken.
Accessories (Bosch part #)
BOSCH is constantly improving its products, therefore
specifications are subject to change without prior notice.
1) 4TWHVK3S vent kit is compatible with this appliance but
Program button (Selectable temperature default).
Failure codes for easy diagnostics and repair.
Real-time diagnostics for troubleshooting/informational
Built in freeze prevention.
Optional wireless remote control to operate with the
Cascading kit (7 709 003 962)
Outdoor kit (7709003913)
Gas conversion kit (8719002176)
Vertical vent kit (ESVVT)
Concentric vent / air intake kit (ESHCK)
Horizontal vent kit (4TWHVK3SII)
Exhaust/Intake bird screen (L2594)
Pipe Cover (PTPCES)
High temperature kit (7736500074)
Recess box kit (7736500043)
Pressure relief valve (7 738 001 152)
Isolation Valve Kit (7738003449)
requires the purchase of an additional 12" piece of straight
pipe to meet minimum vent length requirements. The
aluminum flex piping included with this kit is not
permissible for use with this appliance.