Water Heater Sizing Guide

Remember, these are general recommendations, your Hawn Water Heater Specialist can review your family's needs in even greater detail to make sure the model you choose will always provide enough hot water to meet the demand.

To select the right water heater for your home, you need to consider the size of your family and other factors that contribute to your First Hour Rating Requirement. The chart below provides Residential Electric or Gas Water Heater sizing guidelines for several family sizes.

How to choose the right water heater for you

1. Determine whether your family is Low Demand or High Demand. You should consider your family to be High Demand if...

• There are more than two full baths in the home.

• There are (or will be) teenagers living in the home. It's a fact: teenagers use more hot water for showering and washing clothes.

• If you have an oversized whirlpool bath or other large tub. As a rule of thumb, the water heater tank capacity should be 100% of your bathtub capacity (example: 75-gallon tub / 75-gallon water heater).

2. Find your Family Size and Demand Profile in the chart below, and read across to find the First Hour Rating Requirement for your family. If you decide your family is High Demand, consider moving up to the next First Hour Rating level.

3. Consult the charts on respective water heater specifications for a residential water heater with a First Hour Rating that meets your requirement.