Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
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.
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 Pump Sizing Calculator | Water Heater Size Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 3 | 2 |
| Result | Required Motor Power (HP) | Recommended Capacity (gallons) |
| What it does | 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. | 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. |