Dhw Key (Domestic Hot Water); Set Dhw Temperature; Switch Off Dhw Heating; Eco Key - Bosch Condens 8300i W Operation Manual

3.5

DHW key (domestic hot water)

3.5.1

Set DHW temperature

WARNING
Risk of scalding!
If the device is switched from heating mode to DHW mode, the DHW
temperature may briefly increase above the set temperature if the
heating water flow temperature is set higher than the domestic hot water
temperature.
▶ Do not set the heating water flow temperature above 65 °C (default
setting).
▶ If the heating water flow temperature is set above 65 °C: Use a
thermostatic mixing valve (e.g. shower fitting).
▶ Press the DHW key *.
The set DHW temperature is displayed.
▶ Press the  or  key to set the required DHW temperature
The setting is applied after 5 s or after pressing the OK key.
Measures for hard water
To protect against increased limescale and resulting service work:
If the water is calcareous with a hard hardness range (≥ 15°dH / 27°fH/
2.7 mmol/l)
▶ Set the DHW temperature to less than 55 °C.
3.5.2

Switch off DHW heating

▶ Press the DHW key *.
▶ Press the  key until
The setting is applied after 5 s or after pressing the OK key. The
display shows [.
3.6

eco key

Comfort mode (no eco appears in the display)
The appliance is continually kept at the set temperature in comfort
mode. This results in a brief delay when hot water is drawn. The device
therefore switches on, even if no domestic hot water is drawn.
ECO mode
In ECO mode, heating-up to the set temperature begins as soon as DHW
starts to be drawn.
▶ To set ECO mode, press the eco key.
eco appears on the display.
▶ To return to comfort mode, press the eco key.
eco goes out on the display.
For maximum gas and DHW saving:
▶ Briefly open and close the DHW tap.
The water is heated once to the set temperature.
Condens 8300i W – 6721841532 (2022/05)
appears on the display.
4

Thermal disinfection

To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes.
You can program a heating controller with hot water control to perform
thermal disinfection. Alternately, you can have a contractor carry out
thermal disinfection.
CAUTION
Risk of scalding.
During thermal disinfection, discharging unmixed hot water can cause
serious scalding.
▶ Only use the maximum adjustable hot water temperature for thermal
disinfection.
▶ Inform occupants of the premises of the risk of scalding.
▶ Perform thermal disinfection outside of the normal operating times.
▶ Do not discharge DHW unmixed.
Proper thermal disinfection involves the DHW system including the
draw-off points.
▶ Set the thermal disinfection in the hot water program of the heating
controller ( heating controller operating instructions).
▶ Close DHW draw-off points.
▶ Enable continuous operation of any DHW circulation pump that may
be installed.
▶ Once the maximum temperature is reached, open the DHW draw-off
points one by one, starting from the nearest and ending in the
farthest, and draw off DHW until hot water at 70 °C has been
discharging for 3 minutes.
▶ Restore the original settings.
Thermal disinfection
7