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A 400 watt heater can safely be used on a 15 amp circuit. The size breaker needed for a circuit is determined by the size of the wiring in that circuit. AWG #14 wire requires a 15 amp breaker. AWG # 12 wire requires a 20 amp breaker.

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โˆ™ 2014-03-03 22:51:52
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Q: How many amps breaker is needed for a 400 watt heater?
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