The Ideal thermistor boiler control kit M series decreases the circuit resistance as it gets hotter. The electronic control sends a current to the thermistor and can tell whether a decrease or increase in heat is needed by the relative resistance in the thermistor.
Comes complete with bracket
Technical specification
TypeThermistor Control KitSupplier Part Number170917Brand NameIdeal
Reviews
Ideal Thermistor Boiler Control Kit M Series 170917