6 | Information about the heater US
6 720 647 088 (2011/09)
2.6 Function
• Water comes in through the cold water inlet.
• The flow switch senses water is passing through the
unit. If it detects more than the pre-set level, the
unit’s heating the elements switch on. This is shown
by the neon light glowing.
• The water is heated instantly as it pas ses through the
copper heat exchanger tube.
• The unit is Thermostatic i.e. it will switch the
elements on and off in order to maintain a constant
outlet temperature.
The temperature of the water coming out of the unit
depends on:
• The voltage of the electrical supply,
• The temperature of the incoming water.
• The setting of the temperature dial.
A high flow rate can also negatively effect the hot water
temperature.
Depending on the region of the country, the temperature
of the water supply can vary from 40°F in winter to about
70°F in the summer, with an average of about 50°F.
Extreme weather conditions can cause the inlet
temperature to go outside these boundaries, making it
necessary to adjust the Temperature Adjustment
Spindle and/or the inlet water flow
Manual reset thermal cut-out
• The unit has one double pole thermal cut out which is
mounted on the heat exchanger tube.
• When tripped the cut out needs to be reset manually
inside the unit.
• The cut-out will trip only in exceptional circumstances
(Fig. 2). Call your service person or Bosch
Thermotechnology Corp. if this happens frequently.
Fig. 2
A Thermal cut out
The heater is designed for cold water supply
only. Do not supply with pre-heated water.
WARNING:
B Always switch off the electrical supply to
the unit before you remove the cover.
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