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 Pump Sizing Calculator
Calculate the required pump power output in horsepower given flow demand, total dynamic head, and pump efficiency. Use when selecting or specifying a water pump for irrigation, building supply, or industrial process systems.
Fill in the required fields to see your result.
Key differences
| Water Heater Sizing Calculator | Water Pump Sizing Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 5 | 3 |
| Result | Recommended Tank Size (gallons) | Required Motor Power (HP) |
| 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. | Calculate the required pump power output in horsepower given flow demand, total dynamic head, and pump efficiency. Use when selecting or specifying a water pump for irrigation, building supply, or industrial process systems. |