Estimating Hot Water Needs: What Size Should You Get?

In general, your hot water needs can be measured by the number of bathrooms in your house. The smallest size unit for a one-bathroom house should be 30 or 40 gallons, in either gas or electric. For a 1 1/2-bath house, 40 gallons is minimum. For a 2- to 3 1/2-bath house, choose a 50-gallon gas heater or a 66- to 80-gallon electric one.

 

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