For the automatic control of electric heating loads. The passive infra-red person detector detects whether somebody is present in the vicinity. If somebody is present the heating is controlled by the thermostat. If nobody is present the room temperature is allowed to drop to a lower base level. This base level or ‘set-back temperature’ is also adjustable. WAPIR THX does not have an adjustable front dial. The thermostat setting is adjusted to the preferred setting by use of a spindle on the back of the product. For wall mounting only. PIR/Thermostat Control, for electric heaters Person detector and adjustable thermostat switch Up to 3kW resistive load With hidden thermostat adjustment.