As a supplementary to the page “How to calculate the kW required to heat a volume of water in a particular time”

which requires you to know your volume of liquid to be heated, I thought it’d be useful to share how to do that.

In a rectangular vessel it’s just a matter of multiplying length x depth x height.

And this is where Metric comes into its own over Imperial, as lengths mm/cm/m equate to volumes ml/litres/Hectoliters.

Due to talking to customers about IBC’s, I know a 1m cube of water is 1000 litres and weighs 1000kg or a metric ton.

So, I figure a 10cm cube is a liter. And there are 1000 of those 10cm³ in a 1m³.

So, **if we take our measurements in cm**, multiply the three together, then divide by 1000, it should work.

100 x 100 x100 = 1.000,000 = 1000 litres.

1000 1000

And it does. And I shall add an automated calculation to our Heating Calculations website. Til then, use this.

Now for a cylinder. We need the area of the circle (π × radius²) multiplied by the height.

Pi is 3.142 & is mathematical magic. Radius is the centre of the clock to the circle outer.

Let’s keep it simple and use a radius of 1m, (so a 2m diameter cylinder), and keep height as 1m, and hope for a larger volume than 1000 litres.

Again, **if we take our measurements in cm** then divide by 1000, it should work.

3.142 x 100² x 100 = 3142 litres.

1000

And it does. And I shall add an automated calculation to our Heating Calculations website. Til then, use this.

Any suggestions contact Jamie on 07897 246 779 or email immhtr@gmail.com.

Thanks for visiting.