The Horstmann ServicePlus S11 /S11R time switch will allow up to
3 ON/OFF settings per 24 hours and has a 1 hour manual boost and
advance button to temporarily override current settings.
There is also a programming switch allowing permanent selection of:
OFF/ON/AUTO/ALL DAY.
Additionally, the ServicePlus time switch gives an advance warning
of the annual boiler safety check due date.
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