Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Plumbing
Water Heater Sizing Calculator
Determines the minimum tank capacity (in gallons) your household needs based on occupants, bedrooms, bathrooms, usage pattern, and heater efficiency. Use it before buying or replacing a water heater.
Fill in the required fields to see your result.
Plumbing
Water Heater Size Calculator
Estimates the recommended water heater tank capacity in gallons based on household size and hot water usage habits. Use it when purchasing a new water heater or upgrading to match a growing household's demand.
Fill in the required fields to see your result.
Key differences
| Water Heater Sizing Calculator | Water Heater Size Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 5 | 2 |
| Result | Recommended Tank Size (gallons) | Recommended Capacity (gallons) |
| What it does | Determines the minimum tank capacity (in gallons) your household needs based on occupants, bedrooms, bathrooms, usage pattern, and heater efficiency. Use it before buying or replacing a water heater. | Estimates the recommended water heater tank capacity in gallons based on household size and hot water usage habits. Use it when purchasing a new water heater or upgrading to match a growing household's demand. |