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How long does it take to heat water up?


If you use an immersion heater to heat your household water it is useful to know how long you will have to wait for the water to warm up again so that you can have a shower.

In order to work this out you need to know 4 things:

1. The volume of water that the immersion heater tank holds.
2. How many watts the device uses.
3. The temperature of the water at the moment.
4. The desired water temperature.

You can find the answer to items 1 and 2 on the label on the side of the water heater.
You need a thermometer to find item 3.
The tank temperature necessary for a shower is about 40C
The default values below are for a typical immersion heater for 3 or 4 people.
Please fill in the form below with your own values and then click the button to see the results.

Hot Water Calculator

Please fill in this form with details of your own hot water heater.
Price per kWh