Heaters are designed to protect the contents of bulk containers such as drums, IBC tanks and gas bottles from damage due to cold temperatures. The ATEX-certified heaters can be safely used in hazardous areas or for warming. The heaters are rated IP65/I and acceptable for indoor or outdoor use. An ATEX-certified temperature controller/high limit combination unit is designed for use with the heaters. It offers an operating temperature control, high limit temperature limiter, a power-limiting control, a clear window to monitor temperature, 25 A capacity, and a temperature controlling range up to 842°F (450°C).