Single phase heaters available in all common voltages from 120v to 600v. 11 ga. perforated steel housing powder coated with textured ivory finish. Tamper proof left side control panel houses built-in single pole thermostat with range 50 F- 90 F and disconnect switch. Thermostat on 120v - 277v units is line voltage and low voltage (24v) on 346v - 600v units. Linear limit type thermal overload with automatic reset. Tamper proof fasteners. Stainless steel element with aluminum fins.