Two Channel Central Heating and Hot Water Programmer
The Horstmann C21 two channel programmer gives independent control
over hot water and heating with up to 3 ON/OFF settings per 24 hours.
It also has a 1 hour manual boost button for the hot water and an advance
button for the central heating.
There is also a programming switch allowing permanent selection of:
OFF/ON/AUTO/ALL DAY.
CentaurPlus C21
User Operating Instructions
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