The CREX020 series of heaters are maintenance free and ready for use. This compact convection heater is useful in areas with explosion hazard for prevention of formation of condensation, temperature fluctuations and for protection against frost in transmitter housings, switch cabinets and measuring equipments. This product has a large convection surface, heating capacity is 50 w or 100 w, and it is NEMA 4 rated. Perfect for automotive industries.