Ceramic space heater: Can i cut the wattage in half?
The heater most likely has a AC type fan, so you do not want to interfere with its operation.

Internally for the 'hot' wire going to just the heating element you can insert 2 each 6A06 or 6A10 6 amp diodes in parallel for a 12 amp rating, with a 0.1 ohm 5 watt resistor in series with each diode to balance out the load they see.

Make sure the white 'cathode' band on each diode is pointed in the same direction, such as the heating element.

250 Watts of power is only about 2 amps drawn from the AC line, but the startup current is 3 times that for a couple of seconds. These diodes may get very warm but that is normal.







simulate this circuit &ndash; Schematic created using CircuitLab