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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™ 10y ago
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โˆ™ 13y ago

Electrical power is equal to voltage times current, P = I * V, where P is power, I is current, and V is voltage.

Here, the equation becomes (1500 W) = I * (240 V). I = 1500/240 = 6.25 A

Make sure your electrical system can handle this so that you don't pop a circuit breaker or overheat a wire somewhere.

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โˆ™ 15y ago

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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โˆ™ 11y ago

800 watts/ 240 Volts = 3.34 amps

14AWG wire with a 15 amp will do

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โˆ™ 11y ago

To answer this question a voltage needs to be stated. I = W/E, Amps = Watts/Volts.

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โˆ™ 10y ago

The equation that you are looking for is Amps = Watts/Volts.

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โˆ™ 10y ago

Running on 240 v the heater draws 20 amps so the curcuit breaker should be 25 or 30 amps.

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Q: How many amps needed for a 3000 watt 240 volt base board heater?
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