Unlike ordinary single-stage (on/off hot/cold) gas appliances the Rinnai RHFE1004FA Energy Saver gas heater has the ability to modulate both its burner and blower to provide maximum efficiency and comfort. The Energy Saver furnace incorporates an electronically driven seven-stage gas control system to help maintain an even and continuous heat output for very stable room temperature control and efficiencies in both gas and electrical consumption.
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