Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Water Usage
Hot Water Heater Sizing Calculator
Find the right storage water heater capacity (in gallons) for your home based on bedrooms, bathrooms, occupants, and usage habits. Use it before buying a new water heater or when upgrading an undersized unit.
Fill in the required fields to see your result.
Water Usage
Water Heater Efficiency Calculator
Estimate your monthly water heating cost in dollars based on hot water usage, temperature settings, heater efficiency, and energy price. Use it to compare operating costs before upgrading to a more efficient unit.
Fill in the required fields to see your result.
Key differences
| Hot Water Heater Sizing Calculator | Water Heater Efficiency Calculator | |
|---|---|---|
| Category | Water Usage | Water Usage |
| Inputs required | 5 | 5 |
| Result | Recommended Tank Size (gallons) | Monthly Heating Cost ($) |
| What it does | Find the right storage water heater capacity (in gallons) for your home based on bedrooms, bathrooms, occupants, and usage habits. Use it before buying a new water heater or when upgrading an undersized unit. | Estimate your monthly water heating cost in dollars based on hot water usage, temperature settings, heater efficiency, and energy price. Use it to compare operating costs before upgrading to a more efficient unit. |