FeaturesProvides freeze protection down to -76 deg F/-60 deg C50 W and 80 W models can be mounted directly to manifolds, measuring or analyzing instruments, control valves and similar equipment200/300/400/600 W models are finned heaters that heat the area by transferring the heat from the heater to surrounding air, creating a convection currentTwo thermostat options with a 50 deg F/10 deg C or 68 deg F/20 deg C set point