Thermostatic control coupled with thermal feedback protects unit from overheating and ensures efficient operation. Stainless steel heating element positioned above thermostat for safety in low-water conditions. Rugged enclosed float will not sink. Use in non-metallic tank requires Model 88R metal guard to prevent fire danger. 6 cord with durable anti-rub protector. 120 volts, 60 Hz. UL, CSA listed.