Dual heater installation for utility ethylene glycol heat medium system offers backup capability or increased capacity for future expansion without additional heaters. View of arrangement of ceramic fiber pins and twist lock clip attachment on ethylene glycol system. Utility low-temperature ethylene glycol water heat medium circulation package with provision for future addition of a second heater. Multiple helical coil high efficiency ethylene glycol water heat medium heaters at a northern Alberta heavy oil pilot plant project. Ethylene glycol heat medium heater packages are designed for ease of shipment by rail, highway, or ship transport. The ethylene glycol hot oil heater expansion surge drum has nitrogen controlled to pump NPSH for the hot oil circulation pumps. Access manway panels are provided for internal inspection of ethylene glycol hot oil heaters and expansion surge drums. Phase 1 ethylene glycol heater for shipment to a major transmission pipeline company in northern Canada.