How do I set the boiler to ECO mode for hot water?
Press the eco key until 'eco' appears in the display to activate ECO mode. In ECO mode, heating up to the set temperature begins as soon as the hot water tap has been opened, rather than continuously maintaining temperature as in comfort mode. To return to comfort mode, press the eco key until 'eco' vanishes from the display. (Page 11)
From the official Worcester Greenstar 1000 GR1000W 30C NG Boiler manual, page 11
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