Water Heating Energy Calculator
Estimate the energy needed to heat water by a given temperature rise, using a specific heat of 4.186 kJ per kilogram per degree. Enter mass of water…
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Estimate the energy needed to heat water by a given temperature rise, using a specific heat of 4.186 kJ per kilogram per degree. Enter mass of water and temperature rise to see energy needed and in kilowatt-hours when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (mass of water = 2 kg, temperature rise = 60 °C), the results are: energy needed 502.3 kJ; in kilowatt-hours 0.140 kWh.
Quick reference: mass of water vs result
Reference table based on the example values; it is not your calculation result.
| Mass of water (kg) | Energy needed | In kilowatt-hours |
|---|---|---|
| 1 | 251.2 kJ | 0.070 kWh |
| 2 | 502.3 kJ | 0.140 kWh |
| 4 | 1,004.6 kJ | 0.279 kWh |
| 10 | 2,511.6 kJ | 0.698 kWh |
| 20 | 5,023.2 kJ | 1.395 kWh |
| 40 | 10,046.4 kJ | 2.791 kWh |
Frequently asked questions
What formula does this calculator use?
Energy needed = m × c × dt; In kilowatt-hours = m × c × dt ÷ 3600. Variables: m = mass of water in kg, dt = temperature rise in °C. Fixed values: c = 4.186.
What do I need to enter?
You need mass of water (kg), temperature rise (°C). Results update as you type.
What is an example result?
With the default inputs (mass of water = 2 kg, temperature rise = 60 °C), the results are: energy needed 502.3 kJ; in kilowatt-hours 0.140 kWh.
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