Understanding Water Pressure And Requirements For Tap Installation

Fitting new taps or maybe a shower system involves factoring in water pressure. This very important when choosing your taps as with incorrect choices can lead to poor results once fitted. For example if you install a tap which requires higher pressure than normal in a system which outputs water at a lower pressure than normal, then you will either not receive the water altogether from the tap or it will simply trickle pathetically out of the spout. More often than not this is solely based on the hot water pressure as typically the cold water pressure will be at the pressure of the mains so shouldn’t be too much to worry about.

Prior to purchasing or fitting a tap you should be knowledgeable about the units water pressure is measured in. The common units are bar, PSI and head (metres). These roughly calculate so that 1 bar is equal to 10 metres head which in turn is equal to 14.5 psi.

Often water pressure is dependent on the gravity fed system within a house. The available water pressure in a gravity fed system directly correlates to the height of the cold water storage tank.

The calculation needing to be used to work out the pressure in bar is quite simple. Measure the distance from the bottom of the cold water storage tank to the outlet location. Then take this distance and multiply it by 0.1. This will give you your bar pressure, for example, 1 metre of height equals 0.1 bar, 2 metres would be 0.2 bar and so on.

With this in mind it is no wonder many older houses find it difficult to obtain higher water pressure without the use of a pump or similar. Imagine trying to obtain a 1.0 bar pressure in a gravity-fed system, the tank would have to be a staggering 10 metres above the outlet, just not possible in most houses. If you need to boost the water pressure in your home it may be worth checking out our range of house pumps.