FAQ Feature – Power showers

Friday 5th August 2016

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We know that when it comes to installing a power shower, even the most experienced of installers can have questions about a product or installation. In these FAQ Features, we highlight some of the frequently asked questions that our Customer Services team are asked by the professional installer every day.


Can the hot supply pipework rise from the hot water cylinder in the airing cupboard, and travel through the loft-space before dropping down to an ‘All-in-One’ power shower?
Using ‘up and over’ pipework is inadvisable, as any system generated air will accumulate at the far end of the high-level pipe run. This will not only badly affect the shower’s performance, but can lead to an air-lock which may shorten the life of the pump. The hot supply pipework should drop from the top of the hot water cylinder and travel at a low level before rising up to the power shower. Alternatively, an airing cupboard, floor mounted stand-alone pump that pressurises the hot and cold water to a thermostatic mixer shower, can use an ‘up and over’ pipework.

The ‘All-in-One’ power shower that has been fitted onto a panel wall is excessively noisy. Can anything be done to reduce the noise?
There is the need to de-couple the product from the wall. The installation of a fabricated rubber mounting between the wall and the product will reduce the amount of transmitted motor noise. Rubber wall plugs are available to perform this function. The use of plastic plumbing pipe will also reduce transmitted motor noise compared to rigid copper pipe. If possible, pack some fibreglass in the cavity behind the unit to prevent the air space from resonating.

When a customer turns a hot tap on in the house, the temperature of the shower drops. He has a ‘power shower’ on a gravity system – why is this?
This is occasionally experience when a manual shower (non-thermostatic) has been installed. A thermostatic shower is likely to reduce this temperature drift. If this cannot be achieved, then the cistern to cylinder cold feed pipe either needs to be increased to 28mm or an additional 22mm feed pipe added, using a 22mm T at the bottom of the hot water cylinder. This will reduce the cold feed pressure loss to the hot water cylinder.

The showering temperature on the thermostatic ‘power shower’ is running too cold. How can this be heated up?
During the shower commissioning, the maximum temperature should be set to suit the environment. This is done with the stored hot water at least 12 degrees Celsius above the required blend. If, however, the shower temperature drops after about 10 minutes of being used, then the stored volume of hot water is being depleted. This means the cylinder heat is not keeping up with the demand.

What storage capacity of hot and cold water is required when installing a ‘power shower’?
A good recommendation is a minimum hot water storage capacity of 100 litres and a minimum cold water storage capacity of 230 litres, to provide sensible showering time. Lower storage volumes will result in a shorter shower time.

Have a question on power showers?

We would love to hear from you. Give our Customer Services team a call on 0844 571 5000.