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Hi........you are probably using about 12 to 15 amps with that heater ......the older home that yopu have is only capable of running that 15 amps of power........so the space heater is maxed out on that circuit........so when you go above 15 amps that wire on the circuit will heat up.......you shouldn't be usiung an extension cord on the heater also.........it would probably be best if you could upgrade the wire to 12 gauge and put it ona 20 amp dedicated breaker with a sensor ........you might want to limit the use for now and consult with an electrician
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