Q. How can I avoid low water pressure affecting a shower installation?

Common causes of inadequate water pressure include low mains water pressure and showers piped onto gravity systems or connected to combination boilers. Where lack of pressure is an issue, an orange mechanical indicator light may illuminate to highlight this.


Step one: When the shower is switched on, the indicator should change and the orange light should go off. If this doesn’t happen, there may be a fault with the mains water supply.

Step two: Remove the shower head and block the water flow from the hose with a thumb or finger on cold power setting. If this gradually gets the indicator to lift then it’s the low pressure that’s the issue, and the mains supply is most likely operating correctly.

Step three: If the mechanical indicator is lifting then there is still a bit pressure there. However, it may not be enough to provide maximum flow to the shower. This could be due to having poor water pressure, or signpost that an inlying valve is only partially open. It may also suggest that you need to make sure the stop tap at the point of water coming into the property is fully open too, so there are no blockages or restrictions at all.

If this appears to be the issue, having ensured all valves are fully open the indicator should lift easily and overcome the safety interlocks. Heat should then be provided by the shower’s internal element and the shower can be used accordingly.

Step four: If the mechanical indicator doesn’t rise, then this would suggest the shower has been fitted on a gravity system or it could be joined to a combined heat system. If the showerhead is producing nothing but hot water, even on the cold setting, this clearly indicates this is the case. The easiest way to check is to feel the incoming connection pipe. If that’s hot, then you’re supplying the shower with hot water, which needs further investigation.

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