Water Heater is the second largest contributor to the energy bill after the air conditioner/central heat. Water has high heat capacity, so it takes a lot of energy to warm up. For example, it takes one kilowatt-hour to warm up about 10 gallons of water from 80F to 120F. Your electric or gas bill is noticeably affected by how much hot water you use in your house. That includes showering, clothes washer, dishwasher. Here are some general guidelines for how you can reduce your water heater energy use:

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