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The size of the breakers depends on the voltage. According to the NFPA electrical standard (USA), if the two heaters you describe are "120 volt plug-in" then they are not allowed on the same circuit. Two circuits are needed. The largest general use circuit allowed for 120 volt receptacles is 20 amps and this will not handle your two appliances. An exception may exist if they are hard wired to a dedicated circuit, or if they are 240 volt.

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Q: What size breaker should you use if you have a 1500 and a 1000 watt heater run together?
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