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Electric Technologies: Hot Water

Platens and molds can be heated by running hot water through them. This water is heated between 70-200°F from an outside source such as a boiler or water heater either electrically or using natural gas.

Common Processes:
Molding, Other

Electric boilers (both steam and hot water designs) utilize electric current to heat fluid and then transfer the released heat to water and steam (in steam boilers) and to water (in water boilers). Codes and standards address the allowable heat tranfer rates based on the internal heating surface area. All boilers are classified based on working pressure, fuel used, size and shape and other factors. These factors impact initial cost, performance and space requirements. All systems allow for connecting to a piping system, delivering the heated steam or water to the point of use, and returning cooled fluids to the boiler. Electric boilers are applied in either low- or high-pressure designs and, in general, operating economics favor the electric choice when smaller volumes of steam or hot water are required or in geographic areas with access to very low power cost.

Hot water boilers are generally applied for low-pressure use (less than 15 psig steam and up to 160 psig hot water) and are commonly available in sizes from 35,000 to over 100,000 btu/hour.