Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Solar Water Heater Savings Calculator
Estimates annual energy savings from a solar water heater based on household size, fuel type, solar fraction. Use it when comparing solar thermal to conventional water heating costs.
Annual Savings
668.14 $
167.04: $140-220/person is typical when replacing electric resistance heating (2.8 factor), the most expensive fuel to offset and the fastest payback.
This is annual water-heating savings per person; per-capita savings depend heavily on displaced fuel, since electric resistance heating costs far more than gas to offset.
Solar Financing Comparison Calculator
Compares the true monthly net cost of financing a solar installation with a loan versus the monthly savings it generates, helping you decide whether to pay cash, take a loan, or lease. Use it at the point-of-sale when evaluating installer quotes.
Key differences
| Solar Water Heater Savings Calculator | Solar Financing Comparison Calculator | |
|---|---|---|
| Category | Solar Energy | Solar Energy |
| Inputs required | 3 | 4 |
| Result | Annual Savings ($) | Net Monthly Cost (Loan) ($) |
| What it does | Estimates annual energy savings from a solar water heater based on household size, fuel type, solar fraction. Use it when comparing solar thermal to conventional water heating costs. | Compares the true monthly net cost of financing a solar installation with a loan versus the monthly savings it generates, helping you decide whether to pay cash, take a loan, or lease. Use it at the point-of-sale when evaluating installer quotes. |