Abstract: A space heater having two heating elements and a motor/fan combination for circulating air over the heating elements to supply heated air to an environment includes a system for controlling the operation of the heating elements and the motor in response to heating requirements of the environment. The control system includes a first circuit for sensing temperature to determine a heating requirement to maintain a desired ambient temperature of the environment, a second circuit for independently activating and deactivating the heating elements in according with the heating requirements determined by the first circuit, and a third circuit for activating, deactivating, and variably controlling the volume of air circulated by the motor/fan in accordance with heating requirements determined by the first circuit. The heater housing includes a main housing portion housing the heating elements, an ambient air intake opening, a heated air exhaust vent, and the motor/fan.

Abstract: A fireplace heat exchanger grate comprising an inlet manifold, an outlet manifold and a plurality of heat exchanger tubes or pipes providing communication between the inlet and outlet manifolds. First and second duct sections are in open communication respectively with the inlet and outlet manifolds. A low-profile connector duct section extends across the front of the fireplace in open communication with both the first and second duct sections. The connector duct section includes an internal baffle between its connections to the first and second duct sections. A blower is connected to a first end of the connector duct section. Flow from the blower is directed by the baffle into the first duct section, through the inlet manifold, the heat exchanger tubes and the outlet manifold to the second duct section and outwardly through exhaust vents in the connector duct section on the downstream side of the internal baffle.