How much electricity does is take to heat water?
by 
The Curious Bag
ANSWERS: 1
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In a 40-gallon water heater, bringing the water temperature from 60 degrees F to 140 degrees F uses approximately 7.5 kilowatt hours of electricity. To find your approximate energy cost to heat water, multiply your cost per kilowatt hour times "7.5."
Source:
Resource:
Consumer Energy Center: Home Appliances
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