Use electrical input and realistic running time
This arithmetic tool multiplies input power by operating time and electricity price. It cannot infer a water heater’s duty cycle, hot-water demand or real efficiency from its label.
Use measured or supported figures when available. Do not enter heating output as electrical input. The tool does not model gas water heaters or promise savings.
Explore an electricity-only scenario
Replace every example with your own inputs. Actual consumption varies with controls, temperature, usage and equipment behaviour.
What could this electricity scenario cost?
Example inputs are filled in. Replace them with your own figures for a useful estimate.
Your equipment and usage
Your estimate
- Total electricity
- 360 kWh
- Electricity per day
- 12 kWh
- Cost per day
- USD 1.80
2 kW × 6 hours × 30 days × 0.15 USD/kWh
An electricity-only estimate at the entered power and rate. Excludes standing charges, fuel, installation, and maintenance. Thermostat cycling, hot-water demand and equipment operation can change actual use.
Keep costs separate
The estimate excludes fixed utility charges, installation, maintenance, financing and other fuels. Ask your installer to explain the assumptions behind any comparison between systems.