Shower Pumps Explained - Guide to Shower Pump Installations

Shower Pumps Explained – Guide to a Shower Pump Installation

Shower Pumps Explained – Guide to a Shower Pump Installation

The results presented by this tool are not a guarantee of compatibility or suitability, please consult a qualified plumber with the relevent product specifications to ensure you purchase the correct pump.

Shower Pumps Explained

One of the most frequently asked questions our customer services team answer regarding installing a shower pump is:

Customer: “Can I use this shower pump on my combi boiler system?”

Customer Services: “No, shower pumps are designed to be used only on open vented hot and cold systems. If you require a pump to boost your cold water mains pressure take a look at the Salamander Home Boost."

So if you are still with us and have an open vented hot and cold water supply in your home and want to boost the supply to your shower, first of all lets identify what set-up you have (or which you would like to have) in your home form the diagrams below.

Positive Head Installation
Negative Head Installation

Positive Head Shower Pump Installation:

If your shower head is below the cold water storage tank and when in use you are getting a minimum flow rate of 0.6 litres per minute from it, to boost this you will require a positive head shower pump.

Quick Tip: To calculate your flow rate use a measuring jug and a stop watch to see the volume of water you get into the jug in 60 seconds. If you haven’t got a measuring jug use a 1 litre pop bottle, it should take less than 1 minute and 40 seconds to fill the 1 litre bottle.

Negative Head Shower Pump Installation:

If like the diagram you have the shower head level or above the cold water storage tank outlet. For example a loft conversion or attic room you will require a negative head pump.

Quick Tip: A negative head shower pump will also work if your property also has a positive head installation (as shown in the diagram). So if in doubt it’s a good choice.

Another frequently asked question our customer services team answer regarding shower pumps is:

Customer: “Do i need a twin or single shower pump?”

Customer Services: “This will depend on if you want to boost both or one of the Hot and Cold supplies”

A twin shower pump is designed to be installed onto both hot and cold stored water supplies. This is to ensure that both supplies are boosted to the same level. Therefore giving you a greater level of control when showering.

A single shower pump can only be installed into a single supply, be it – premixed (see diagram), hot or cold supply. These days single shower pumps are mainly used to boost the hot supply if the cold is mains fed or if due to location it is easier to install two single shower pumps rather than one twin shower pump.

Quick Tip: The pressure of Shower Pumps is measured in 'Bar'. If you are struggling to work out what pressure you need this may help.

Bar Pressure

Pumps are rated in ‘bar’ which is the measure of pressure – 1 bar pressure being equal to 10 metres static head of water.

The higher the bar rating the higher the pressure. The following is a general guide for applications:

Up to 1.0 bar pressure = Low boost

Up to 2.0 bar pressure = Medium boost

3.0 bar plus bar pressure = High boost

We hope you found our shower pumps explained a useful guide. Hopefully by this stage you will know the type of shower pump you require! So why not take a look at our latest range of shower pumps from some of the leading UK manufactures.

Stuart Turner Shower Pumps

Stuart Turner Pumps
Salamander Pumps

Salamander Pumps

If you are still undecided and need help with which shower pump to choose you can call friendly and knowledgeable technical advisers on

Stuart Turner on 01491 572655

Salamander Pumps on 0191 516 2002

Share this Post