Bosch ZSB 30-2 A Operating Instructions Manual page 25

eco button
Pressing and holding the eco button until it lights up switches
between Comfort mode and Economy mode.
Comfort mode, (Eco button is not lit - default setting)
The appliance is held constantly at the set temperature. This
means that hot water is available almost instantaneously at the
tap.
Consequently the appliance will switch on at intervals, even if no
hot water is being drawn.
Economy mode, Eco button lit
If a start delay for the supply of water preheated by
solar energy has been set (service function b.F), the
appliance does not switch on until the start delay
has elapsed.
The water is not heated up until a hot water tap is turned on.
•
With a demand signal (only with start delay switched off for
•
the supply of water preheated by solar energy). Briefly turning
a hot water tap on and then off signals demand so that the
water is then heated up to the set temperature.
The demand signal enables gas and water savings.
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