Water Heater Energy Cost Calculator
Work out the monthly electricity cost of an immersion or electric water heater from its power and hours of use.
Compare Your Options And Get Clear Answers
Work out the monthly electricity cost of an immersion or electric water heater from its power and hours of use.
Water Heater Energy Cost Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Water Quick Guide
Typical values for reference.
| kW | Hours/day | Days | Cost |
|---|---|---|---|
| 2 | 1.5 | 30 | £25.20 |
| 3 | 2.5 | 30 | £63.00 |
| 3 | 4 | 30 | £100.80 |
| 4.5 | 3 | 30 | £113.40 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Water Heater Energy Calculator FAQ
Answers to common questions about this calculator.
About 84p at 28p per kWh.
Many tanks need 2 to 4 hours a day depending on use.
Cost = power x hours x days x unit price.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.