Industrial Tank Style Engine Heaters Hard-wire electrical connection, Single Phase. These pressure die-cast aluminum tank engine heaters are designed to circulate coolant through engines ranging in size from 200 CID to 1650 CID. Wattage options range from 1500w-5000w with various voltages available. These single-phase engine heaters are designed for hard-wire electrical connection using rigid or flexible conduit. All models are available with or without flow-through thermostat assemblies. Data Sheet (.pdf)   Hotstart CB, CL Part Numbers