An electric heating coil is a resistance heating element that converts electrical energy into thermal energy to warm air in HVAC systems. Electric heating coils are used as primary heaters in heat pumps, supplemental heaters in cold climates, and emergency heating in commercial HVAC applications.
Technical Details
Electric heating coils operate at 208V, 277V, 480V, or 600V three-phase power depending on building electrical service. Capacity ranges from 5 kW to over 100 kW, with output measured in kilowatts (kW) or BTU/h (1 kW equals approximately 3,412 BTU/h). The coil’s surface temperature typically reaches 800°F to 1,200°F, requiring proper airflow to prevent overheating. Staged heating elements allow incremental capacity increases and better temperature control.
Applications and Significance
Electric coils serve as supplemental heaters in heat pump systems during low outdoor temperatures and backup heating during mechanical failure. They’re installed in packaged units, air handlers, and duct-mounted applications. Electric heating is 100 percent efficient at converting electricity to heat but has higher operating costs than fossil fuel systems. Proper temperature limits and airflow sensors prevent coil burnout and safety hazards.