The rotary thermostat is rated at 3000W and can be used for most heating applications where a maximum temperature of 40C is appropriate. The thermostat includes 2 indication light lenses whereby the one shines orange when the power is on and the 2nd has 2 lights behind it, one to show heating (red) and the other to show the desired temperature has been reached (green). The thermostat can be used for both air control installations and capillary sensor installations which is controlled via a dip switch positioned on the PCB. The default factory setting is set for air sensor control and to change to capillary control the switch must be brought forward. Accessories: Fixing Frames Cover Plates