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Technically it's a 20 amp load (20A x 240V = 4800W). However, you should not run a breaker at full load. The breaker is to protect the wiring from overheating and from short circuits. You should use 10 gauge wire and a 30 amp double pole breaker.

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โˆ™ 2010-01-22 22:10:22
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Q: 4800 watt heater that's 240 volts What size breaker is needed?
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i have a 4800 watt heater that's 240 volts. What size breaker is needed?

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It could, it depends on what the manufacturer's nameplate reads as to the voltage and amperage of the heater.

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If the heater is rated as a 3 phase 480 volt heater then a neutral is not needed. If the voltage stated is 277 volts three phase then a neutral is needed.

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Watts = Amps x Volts. Amps = Watts/Volts = 4.16. The smallest breaker in a house panel is 15 amps. You will need a 2 pole 15 amp breaker. On a # 14 wire you can load that circuit up to 12 amps.

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