Heat Pump Water Heater Size Calculator
Find out the correct size heat pump water heater for your home by entering the details below. This calculator considers your household's water usage and climate conditions to help you choose the most efficient and appropriate unit.
Understanding Heat Pump Water Heater Sizing
Choosing the right size heat pump water heater is important to ensure your household has enough hot water, while avoiding unnecessary energy use. Too small of a unit will struggle to keep up with your needs, while an oversized unit will consume more energy than necessary.
Factors Affecting Heat Pump Water Heater Size
| Factor | Description | Impact on Size |
|---|---|---|
| Household Size | The number of people in your household determines the amount of hot water needed. | Larger households need larger units. |
| Daily Water Usage | The more hot water you use daily, the bigger the heat pump water heater needs to be. | Higher daily usage requires more capacity. |
| Temperature Rise | The difference between your incoming water temperature and your desired hot water temperature. | Larger temperature rise requires a more powerful heater. |
| Climate | The climate you live in affects the efficiency of the heat pump water heater, as it relies on ambient air temperature for heating. | Colder climates may require a larger unit or more energy to heat the water. |
Heat Pump Water Heater Size Calculation
To calculate the required size of your heat pump water heater, we consider the following factors:
- Daily Water Usage: The total amount of hot water you use in a day.
- Temperature Rise: The temperature difference between your incoming water and the desired temperature.
- Climate: Colder climates require more heating energy to produce hot water.
The formula for determining the required size (in gallons per minute, GPM) is:
Required Size (GPM) = Daily Hot Water Usage (gallons) / 2.4
Recommended Heat Pump Sizes for Different Usage Levels
| Household Size | Average Daily Hot Water Usage | Recommended Heater Size |
|---|---|---|
| 1-2 people | 20 - 40 gallons | 2 - 3 kW |
| 3-4 people | 40 - 80 gallons | 3 - 4 kW |
| 5+ people | 80+ gallons | 4 - 6 kW |