Bosch Greenstar ZBR16-3A Operating Instructions Manual page 26

26 | Operation
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)
In Comfort mode, the DHW tank has priority. The DHW tank is
heated to the set temperature first. Then the appliance
switches to central heating mode.
•
Economy mode, ECO button lit
In Economy mode, the appliance alternates between central
heating mode and DHW mode.
6 720 644 013 (2011/02)