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When considering the purchase of a new hot water tank, the cost of heating the water is 20% of your household energy budget.

For example, if you buy the 50-gallon hot water tank, it should have an FSH of 90, telling you it can provide 90 gallons in that peak period. 5 or more people-over 56 gallons (add 10 gallons per additional person) 80-gallon tank electric or 50 gallon-tank gas tank.Īnother number to calculate when buying a new water heater is the First Hour Rating (FHR).3 to 5 people-46 to 56 gallons 50-gallon tank electric or 40-gallon gas tank.2 to 4 people-36 to 46 gallons 40-gallon tank.1 or 2 people-23 to 36 gallons 30-gallon tank.Here’s a general estimate of gallons needed depending on household size: When a water heater tank is fully heated and waiting for activity, the FHR shows how efficiently the tank can handle refilling and heating in that peak hour of usage where showers and washing happen. So if you’re in a family of four, a 50-gallon water tank should cover all those showers and washings.Īnother number to calculate when buying a new water heater is the First Hour Rating (FHR).

On average, hand washing takes about two gallons, Running the dishwasher uses 14 gallons, bathing/showering per person is 20 gallons, and washing a load of laundry is 30 gallons. How many people are in your household is a great place to start calculating gallons. It’s time to consider a new water heater, but how many gallons do you need for you and your family? Constant showers, constant clothes washing, and dishwashing lead to cold showers very quickly. *sigh* You check your water tank and realize it’s just too small when you bought it before having two teenage children who play sports and eat from every plate in the kitchen. You’re taking the last shower of the morning and, what was once steaming two hours ago, is now ice cold.