This is the cost effective way to turn on your system. The following units will automatically turn on when the temperatures are cold and turn your ice melt system off when it is warm.
Model AP 3550 Ambient Thermostat — Plug and Play
This thermostat will automatically turn on when the temperature drops below 35 degrees (F). The Thermostat Extension Cable is simple to use. Plug one end directly into any 120V outlet and the other end into your heat trace assembly. The Thermostat Extension Cable has an LED indicator that illuminates when the thermostat is activated. It will remain activated until the ambient temperature rises above 50 degrees (F).
Model SST-2 Freeze Protection Thermostat
The C-UL-US listed SST–2 Freeze Protection Thermostats replace electromechanical thermostats in cost-sensitive applications requiring ground fault equipment protection (GFEP). The SST–2 is listed by Underwriters Laboratories to Standard UL 873 for Temperature- Indicating and -Regulating Equipment.
Nelson TF4X40 Thermostat
These Thermostats are used for controlling heat tracing systems in ordinary locations. The capillary bulb should be mounted on the side of the pipe. A low-cost option to turn on your system when it is cold enough to freeze and shuts off when the freeze danger is gone.