1 Answer
https://www.dmme.virginia.gov/DE/LinkDocuments/HandbookWaterHeating.pdf
Like most home appliances, water heaters have become much more energy efficient in recent years. A decade ago 25 percent of our home energy dollars typically went to heating water; today the Department of Energy claims water heating accounts for about 18 percent of your utility bill.
Water heaters last 10 to 15 years on average. If yours is more than seven years old, replacing it with a more efficient model could save you money in the long run.
http://www.consumerenergycenter.org/residential/appliances/waterheaters.html
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