The HeatingSave Energy Management Controller, the centrepiece of any HeatingSave system, features 8 temperature/light level/humidity analogue sensor inputs, 8 occupancy sensor/switch digital inputs and 8 mains relay outputs. However, if that's not enough, up to 16 additional networked sub-controllers can also be added to the system in order to expand its overall range, each sub-controller supporting an extra 8 analogue and 8 digital inputs, as well as 8 relay outputs.