General Size Guidelines per household size shown below.
Add 3-1/2 gallon tank capacity for each additional bathroom In the home.
If there is an automatic dishwasher add 5 gallons to the water heater capacity.

1-2 people:        2-3 people:      3-4 people:      5+ people:
30-40 gallons     40-50 gallons     50-60 gallons     60-80+ gallons

What is a Water Heater?

A Water Heater is an appliance designed to provide a steady supply of heated water for residential or commercial use. It ensures that water is available at the right temperature for bathing, cooking, cleaning, and other everyday needs. By heating and storing water in a tank—or heating it on demand—water heaters make modern living more convenient and efficient.