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A radiant electric heater (2) comprises a base (8) of insulation
material having a surface supporting at least one electric heating
ribbon element (10) supported on edge. A rod-like temperature-responsive
device (16) extends lengthwise partly across the heater (2) from
an edge and over the at least one electric heating element (10).
The surface of the base (8) is provided with an elongate recess
(22) with sloping sides (24, 26) extending beneath and along the
length of the temperature-responsive device (16). The ribbon (10)
is supported in and traversing the elongate recess (22) such that
an upper edge (28) of the ribbon (10) substantially follows a contour
of the surface of the recess. The upper edge (28) of the ribbon
(10) at a region (30) underlying the temperature-responsive device
(16) is provided at a predetermined distance from the temperature-responsive
device (16) and is at a lower level relative to the upper edge (28)
of the ribbon (10) at regions at either side of the elongate recess
(22).
A portable electric heater possessing characteristics similar to
a portable electric oil filled heater absent the use oil and its
associated manufacturing and environmental problems. The device
includes an electric heater, a rotatable plenum and an external
housing providing space saving characteristics.
An electric heater is provided with an identifying resistor associated
with a connection between the heater and a fan control. When the
electric heater is connected to the control, the identifying resistor
provides information with regard to the capacity of the particular
electric heater that is being attached to the control. The control
then utilizes this particular capacity to control both the electric
heater and an associated fan motor.
Methods and systems are provided for controlling the output power
to DC electric heater elements to reduce the input current ripple
and to fine-tune the output power to meet the fine-tuning percentage
requirement. In one embodiment, a method is performed for controlling
output power to heater elements in an electric heater system. The
process includes receiving a power request by the heater system,
providing output power controls for each heater element, and determining
a particular output power control based on output power controls
provided for each heater element and the power requested. Further,
the heater system selectively controls the output power to one or
more of the heater elements to meet the power request.
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