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Check the appliance's specifications on the strip, tag or plate that is usually fixed either on the back or somewhere on the frame. On there you will find its required operating voltage and wattage that it draws.

If your home has 240 volt line voltage just divide the watts by the volts for the answer.

Example: a 2400 watt water heater for a 240 volt line using the formula watts / volts = amps would give you 10 amps. For a 120 volt appliance it would be 20 amps.

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Nathaniel Lebsack

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1y ago
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14y ago

The average 120 V space heater uses around 1500 watts and draws 12.5 amps, which is quite a bit. If run for only one hour (during a billing month), your power company will bill you for 1.5 kilowatt-hours--just for the space heater!! If run for 10 hours during a billing month, they will charge for 15 kWH. It adds up fast! So if you're using a space heater frequently, and your power bill seems high, that's why! Space heaters are not efficient when heating a large area. Also, I don't really like space heaters because they can be very dangerous if not used properly.

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Wiki User

13y ago

Block heaters are in the range of 1200 watts. They should be on a dedicated circuit. Many garage outside plugs are on the same circuit as the garage inside

receptacles. People who have a second refrigerator or freezer in the the garage should be aware that the breaker will trip if both the block heater and the appliance try and operate at the same time.

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13y ago

It is dependent on the wattage rating of the heater. The higher the wattage, more electricity is consumed. Watts = Amps x Volts.

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13y ago

Usually between 1000-1500 watts

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Q: How much power does a heater use?
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