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Q: What wattage space heater will heat a 280 square foot room?
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How much amperage does a three foot base booard heater draw?

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A base board heater could be rated at any amount of watts. Their physical size usually has no bearing on the wattage but that being said usually the smaller the physical size the lower the wattage. A three foot unit at 240 volts could be 500 watts or .5 kW. The rating of the heaters is on the back of the heater. If the heater is mounted and you want to know how many watts it is, you will have to remove the heater away from the wall to get to the nameplate. If you have access to a clamp on amp meter, the amperage reading can be multiplied by the voltage of the heater. This will give you the wattage of the device. To find kW divide the wattage of the heater by 1000. The amount that the heater uses in kW s depends on its off and on time cycle. This is referred to as kWh. This is the figure that the utility company uses, times how much they charge for a kWh, to calculate the charge to you for the power that you have used.


What size space heater is needed for a 10 by 12 foot room?

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