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What size Electric Baseboard or Space Heater do you need?
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First - Measure the length and width of the room to determine total square footage.
Second - Select your level of insulation
- Poor - Little insulation (Older homes) - 12.5 watts per foot
- Average - R-11 in walls and R-19 in ceiling - 10 watts per square foot
- Full - R-19 in walls and R-38 in ceiling - 7.5 watts per square foot
Third - Make adjustments as necessary.
- For ceilings above 8 feet - increase wattage by 25% for every additional 2 feet in height
- Use a minimum of 1000 watts in a bathroom
- If a recommended wattage falls between two sizes - select the large heater
- For colder climates (prolonged winter temperatures below 20°F) use the next higher wattage up
to 15 watts per square foot
Fourth - Use the chart below to calculate the recommended wattage or calculate
it yourself with this example:
A room that is 10 feet wide by 13 feet wide with an 8 foot ceiling
and Average insulations =
10 x 13 = 130 then 130 x 10 watts/per
square foot = 1300 Watts
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Room Size
(Sq Ft with 8 foot ceiling)
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Watts
(Poor Insulation)
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Watts
(Avg Insulation)
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Watts
(Fully Insulation)
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20 square feet
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250
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250
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250
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40 square feet
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500
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500
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500
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60 square feet
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750
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750
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450
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80 square feet
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1000
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1000
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750
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100 square feet
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1250
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1000
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750
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120 square feet
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1500
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1250
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1000
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140 square feet
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1750
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1500
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1250
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160 square feet
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2000
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1750
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1250
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180 square feet
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2250
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2000
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1500
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200 square feet
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2500
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2000
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1500
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220 square feet
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2750
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2250
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1750
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240 square feet
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3000
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2400
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2000
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