IDEAL LOGIC+ Combi User Manual page 13

advaNCEd FEaTURES
B. TIMED PRE-HEAT
When Domestic Hot Water preheat is switched on the boiler control the boiler will preheat from the beginning of
the first timed on central heating period of the day to the end of the last timed on central heating period of the
day, so as to provide more efficient water delivery. This function is disabled when the preheat switch is set to off.
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