Are your snow melting systems manually or automatically activated?

Hott-Wire systems can be activated with an aerial mounted moisture and temperature sensor, temperature sensor, pavement-mounted snow sensor, or 12 hour timer. The aerial and pavement mounted sensor will automatically turn on when the temperature is below 38 degrees and there is moisture on the sensor. Heatizon has its own engineered relay panel (M330) offering 30Amp or 50Amp relay switches for single activation of multiple circuits.