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Old 03-15-2011, 08:19 PM   #1
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wire size for 1500 watt baseboard heater


I'm installing a baseboard heater and thought I should probably use No. 12 wire and a 20 amp breaker. Am I right? Thanks.

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Old 03-15-2011, 08:40 PM   #2
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wire size for 1500 watt baseboard heater


What voltage?

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Old 03-15-2011, 08:42 PM   #3
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wire size for 1500 watt baseboard heater


120 volts
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Old 03-15-2011, 08:45 PM   #4
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wire size for 1500 watt baseboard heater


Yes, use 12-2 with ground.
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Old 03-15-2011, 08:46 PM   #5
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wire size for 1500 watt baseboard heater


Thanks Bud
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Old 03-16-2011, 12:53 PM   #6
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wire size for 1500 watt baseboard heater


Here I am again. My wife just found a wall hung heater rated 1000w with a boost to 2000w. It is 240 v. Will 12-2 wire be sufficient or should i use 12-3. Should I use a 40amp double pole breaker? Hope I'm right. Thanks
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Old 03-16-2011, 01:08 PM   #7
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wire size for 1500 watt baseboard heater


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Here I am again. My wife just found a wall hung heater rated 1000w with a boost to 2000w. It is 240 v. Will 12-2 wire be sufficient or should i use 12-3. Should I use a 40amp double pole breaker? Hope I'm right. Thanks
12/2 is still fine and use a 20A 2 pole breaker.
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Old 03-16-2011, 05:13 PM   #8
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wire size for 1500 watt baseboard heater


The reason you can still use 12-2 is because watts are watts and you will be wiring this heater at 240 volts.
Power = voltage X Current. The power remains the same but because the voltage doubled, the current will be 1/2.
Circuits powering in place heaters are sized at 80% so:
120 volts X 20 amps (12 ga wire) = 2400 watts X 80% = 1920 watts
240 volts X 20 = 4800 watts X 80% = 3840 watts
You could actually do it with 14 ga wire
240X15=3600 X 80% = 2880 watts

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