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Boiler has two switches, and both seem to be linked to an immersion heater? | DIYnot Forums
Horstmann Electronic 7 Digital Immersion Heater Controller With 3 Off-Peak Heating Periods Per 24 Hours
How to wire off-peak water heater:
Horstmann BX2000 White Electronic Water Heating Boost Controller With 2 x Double Pole Isolator Switches For 24 Hour & Off-Peak Electricity Supply & 1 ...
BX2000 – United Kingdom
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