Hot water heaters with the storage tank are the norm for most homes. The greatest difference you'll see besides manufacturers is warranty. The same heater can have several different prices because of the warranties, usually 6 year, 9 year and 12 year. A person who is single, living alone would do just fine with a 30 gallon, a couple could probably do the same. A three or four person family can get away with a 40 gallon and any larger would need 50.
There is a way to get a 75 gallon heater but it will need to be a heat pump unit. Rather then re-writing all the information Click here for info
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