Generally, the size of your heater depends on the amount of bathrooms in your home, the size of your bathtubs, and the amount of people that will be using water. 30 to 40 gallon heaters will typically supply a one bathroom home. As the amount of bathrooms increase, the size of your heater needs to increase.

Keep in mind that electric water heaters require more time to heat, and will therefore need a larger tank to store the water, as opposed to gas heaters. For this reason, homes that would require a 50 gallon gas heater will need an larger electric one.

If you are noticing that there isn’t enough hot water during your showers and such, you may need to upgrade to a larger tank, or install a second water heater to provide more storage space.