These common devices carry the disadvantage of using high-grade energy to do a low-grade task. Their advantages, however, are impressive: low first cost and individual thermostatic control that can easily be used to make each room a separate heating zone.
Thus, the energy wasted at the electricity-generating plant (usually 60% to 70%) can be partially “recovered” at the building, where unused rooms can remain unheated.
As in the case of metal wood stoves, surfaces can sometimes reach high temperatures, requiring care in the location of heaters relative to furniture placement, draperies, and traffic flow.
Electric heaters are sized by their capacity in kilowatts (1 kW = 3413 Btu/h). The maximum watt density allowed is 250 W per linear foot of heater (820 W per linear meter).
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