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  The 'Rule of Thumb' test
  How to estimate the pressure of the hot and
cold water supply in your home


 

What is your shower water pressure?  Why is this important?

The supply pressure to a showerhead is the major factor that determines the shower flow rate, and therefore the water and power consumption.

If you have a low household water pressure, then your shower flow rate may already be quite lowMost water-saving showerheads are designed to operate with medium to high supply pressure and if used at low pressure their performance may be affected.

 

How do you estimate the pressure?

  • Remove your shower rose – if unsure how to do this then please follow the instructions available here ('How to install your new showerhead')

  • Turn on the hot and cold taps to set the water temperature to what you would regard as a comfortably hot shower setting.

  • Then place your thumb firmly over the shower arm outlet.  Are you able to stop the water flow? You may wish to do this test using one stronger and one less strong adult member of the household.

Use the following table to give an approximation of your current shower pressure.


 

Action and Effect

Approximate Water Pressure*

Less strong adult

Stopped easily

100 kPa or less

‘’

Stopped with difficulty

150 kPa

‘’

Cannot be stopped

200 kPa

Stronger adult

Stopped easily

150 kPa or less

‘’

Stopped with moderate effort

200 kPa

‘’

Stopped with difficulty

250 kPa

‘’

Stopped with great difficulty

300 kPa

‘’

Cannot be stopped (except by Superman!)

300 kPa or greater

 

 

As you can see, it is not difficult to estimate your water pressure

easily stopped - less than 150kPa
difficult to stop - over 250kPa

As long as you have a pressure of at least 2 bar, preferably  3, then an Eskom tested water-efficient showerhead such as Oxygenics is for you.

It is also worth doing this same test with your thumb over the shower arm outlet, and turning on the hot and cold separately, one after the other (either/or) and if there is a significant difference in pressure on the two sides, then your hot and cold pressure is not the same. 

This may indicate an imbalance in supply pressure, and could mean, for various technical reasons, that you should not install any brand of water-efficient showerhead

 

 
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How to!!!

Measure your shower
flow rate


Estimate your home
water pressure


Calculate your likely savings

Install your new showerhead


 
 
 

- 2007 Eternally Solar CC -

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