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Water Heater Sizing Calculator

Estimate recommended tank size for your household

Water Heater Sizing Tool

Number of Bathrooms Number of People in Household Peak Hour Usage (gallons)

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How to Use

Enter the number of bathrooms, household members, and estimated peak hour usage. The calculator estimates the required water heater tank size.

Example

Bathrooms = 2
People = 4
Peak Hour Usage = 50 gallons
Recommended Tank Size = 50 + (4 × 10) = 90 gallons

Tips

Peak hour usage is the busiest hour of hot water consumption.
10–15 gallons per person per hour is typical for estimation.
Consider slightly larger tanks for families with heavy hot water needs.