Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Climate
Heat Pump Efficiency Calculator
Calculate how many years it will take to recover a heat pump installation cost through energy bill savings compared to your current heating system. Use it before purchasing or when applying for rebates.
Fill in the required fields to see your result.
Climate
Rainwater Harvesting Calculator
Estimate how many gallons of rainwater your roof can collect each year and how much you could save on your water bill. Ideal for homeowners planning a rain barrel or cistern system.
Fill in the required fields to see your result.
Key differences
| Heat Pump Efficiency Calculator | Rainwater Harvesting Calculator | |
|---|---|---|
| Category | Climate | Climate |
| Inputs required | 4 | 4 |
| Result | Annual Savings After Payback ($) | Annual Water Cost Savings ($) |
| What it does | Calculate how many years it will take to recover a heat pump installation cost through energy bill savings compared to your current heating system. Use it before purchasing or when applying for rebates. | Estimate how many gallons of rainwater your roof can collect each year and how much you could save on your water bill. Ideal for homeowners planning a rain barrel or cistern system. |