The D21-TS electronic controller has been designed to take full advantage of our patented Air-Flow Sensor which modulates the heater’s capacity according to the quantity of air flowing through the heater by responding to the radiant heat of the elements even at very low CFMs. Wit...

It offers additional protection against overheating. It is standard on heaters of 30 KW and less and not in excess of 300 volts, and optional on all others. This switch must be manually reset to make the heater operational.

The D21-TSSR electronic controller has been designed to be a compact solution that takes full advantage of our patented Air-Flow Sensor which modulates the heater’s capacity according to the quantity of air flowing through the heater by responding to the radiant heat of the eleme...