Setting The Hot Water Temperature; Domestic Hot Water (Dhw) - Bosch GREENSTAR HEATSLAVE II EXTERNAL 12/18 User Instructions & Customer Care Manual

OPERATING THE BOILER

SETTING THE HOT WATER TEMPERATURE:

The hot water temperature control knob sets the temperature of the heat store. A high setting will
give a higher hot water temperature and greater quantities of hot water.
1. Turn the hot water temperature control knob to the desired level between 1 and 8, this will be
shown on the digital display.
2. The tap symbol will be displayed to confirm that the hot water setting is being changed.
3. The value is displayed during this process, press to exit or after five seconds of inactivity
the boiler display will return to the default screen.
B

DOMESTIC HOT WATER (DHW):

The GREENSTAR HEATSLAVE II is microprocessor controlled and at low DHW flow rates
(washing hands etc), the burner will not fire up when the tap is opened as the heat store will meet
the demand, but at high flow rates (filling a bath for example) the burner will fire up to boost the heat
store and meet the demand.
C
D
If DHW is OFF on the programmer, the appliance will still supply DHW using heat stored in the
tank, but it will not reheat the tank, therefore the amount of water available is limited but is adequate
for washing up, filling basins etc.
We recommend that DHW is timed off overnight and when the home is unoccupied to save energy.
The timer should be set for at least half an hour before normal hot water demands are expected to
reheat the heat store.
When reheating the heat store the controls will scavenge heat from the boiler for the tank, this
means that the pump will run (and the blue light will be on) for some time after the burner has
turned off whilst heat scavenging takes place.
WARNING: care should be taken when washing your hands as in some circumstances the
combination of low water flow rate and high setting of the hot water control thermostat can result in
very hot water at the tap at the start of the demand.
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GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
OPERATING THE BOILER
6 720 805 212a (07.2013)