About the Water Heating Cost Calculator
Water heating is often the second-largest energy use in a home.
This tool compares heating methods so you can pick the cheapest and cleanest.
How this calculator works
We estimate the energy to heat your daily hot water, then apply each system’s efficiency and fuel price.
Why it matters
- Compare heating technologies
- See heat-pump savings
- Factor in solar water heating
- Cut a major energy cost
Frequently asked questions
Heat-pump water heaters are usually cheapest to run, especially paired with solar.
In sunny climates it can cover most hot-water needs with a short payback.