Water Heater Cost Calculator

Estimate the cost to heat water from liters used, temperature rise, efficiency and electricity rate.

Your result will appear here

Enter values and press Calculate.

How to use this calculator

Enter the values requested in the calculator form.
Press Calculate to generate the result instantly.
Compare the answer with the formula and examples below.

Examples

100 liters heated by 40°C needs about 5.17 kWh at 90% efficiency.

Frequently Asked Questions

Is this exact?

It is an estimate. Real systems lose heat through pipes and tanks.