Heat Pump Water Heater Savings Calculator
Compare annual water-heating energy and cost for a conventional electric heater and a heat-pump water heater using editable hot-water use, efficiency, COP and energy price.
Default project preview
$416.18 per year
Current annual energy
3,288 kWh
Heat-pump annual energy
976 kWh
Annual thermal demand
3,124 kWh
Simple payback
4.3 years
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Daily hot-water use
Enter this project assumption in gal/day. The current imperial default is 50 gal/day.
Average temperature rise
Enter this project assumption in °F. The current imperial default is 70 °F.
Operating days per year
Enter this project assumption in days. The current imperial default is 365 days. Minimum: 1. Maximum: 366.
Current heater efficiency
Enter this project assumption in %. The current imperial default is 95 %. Minimum: 1. Maximum: 100.
Heat-pump water-heater COP
Enter this project assumption in a unitless value. The current imperial default is 3.2.
Electricity price
Enter this project assumption in per kWh. The current imperial default is 0.18 per kWh. Minimum: 0.
Extra installed cost
Enter this project assumption in a unitless value. The current imperial default is 1800. Minimum: 0.
How to read the outputs
Current annual energy
95% efficiency. Default preview: 3,288 kWh.
Heat-pump annual energy
COP 3.2. Default preview: 976 kWh.
Annual thermal demand
heat delivered to water. Default preview: 3,124 kWh.
Simple payback
extra installed cost ÷ savings. Default preview: 4.3 years.
10-year gross savings
before maintenance and rate changes. Default preview: $4,161.79.
10-year net after premium
simple undiscounted estimate. Default preview: $2,361.79.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Water-heating demand uses water volume × temperature rise × water heat capacity. Current input divides by efficiency; heat-pump input divides by COP. Savings equal the annual input-energy difference × electricity price.
Related tools
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FAQ
Heat Pump Water Heater Savings Calculator questions
Why does installation location affect savings?+
A heat-pump water heater draws heat from surrounding air, so ambient temperature and available room volume affect performance.
Does this include cooling or dehumidification benefits?+
No. Any effect on surrounding-space heating or cooling is excluded.
Is simple payback the same as lifecycle cost?+
No. Lifecycle analysis also includes maintenance, replacements, financing, incentives and future energy prices.