A hot box designed to heat with electric or steam is providing flexible heat for a petrochemical plant in Indonesia.

The facility uses large utility boilers in the plant during the regular work week, but on weekends and holidays, it is not cost effective to run the large boilers. Because the petrochemical company still requires the drums in the hot box to stay warm, the heating equipment manufacturer, Lewco Inc., Sandusky, Ohio, designed a drum-heating oven that can be manually switched between steam and electric heat. This ensures the petrochemical plant’s products stay warm at all times.

To minimize floor space but still maintain good convection inside the cabinet, the customer requested dual circulation fans be located on the roof. Lewco’s standard electronic controls were included along with a manual switch to allow the operator to change from normal steam heat to electric heat.