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How to Select the Right Shower Pump

If you suffer from poor water pressure in your home a shower pump can often be the perfect solution to boosting water performance. The results are; improved shower performance, quicker bath fill and strong flowing taps. However, it is important to make sure that you get the right pump for your heating system.

Which heating system do I have?

GRAVITY FED
If you live in an older property there’s a good chance you have a gravity-fed system, renowned for poor pressure and flow.
COMBI BOILER
Combination boilers are common and rely solely on mains pressure to deliver water around your home.
UNVENTED
Unvented systems require a seperate hot water cylinder to store a quantity of hot water at mains pressure.
 

Where the cold water tank is also affects which pump you need:

For gravity fed systems, the gap between the bottom of your cold water storage tank and the highest point in your pipework or highest outlet determines whether your system is positive or negative head.

niversal (negative head pumps) will work in both situations, so if you are unsure, choose a negative head pump, or call us for advice.

YOU HAVE A POSITIVE HEAD SYSTEM... If you have more than 600mm from the bottom of your cold water storage tank to the highest point in the system after the pump.

For example, the illustration below shows a shower with pipework below the dotted line indicating the 600mm point.

YOU HAVE A NEGATIVE HEAD SYSTEM... If your outlet or highest point in the pipework after the pump is above, or in line with, the 600mm point below the cold water storage tank.

For example, the illustration on the right shows a shower in the attic with pipework above the dotted line indicating the 600mm point.

You also have a negative head system if you time how long it takes to fill a measuring jug and:
  • it takes more than 30 seconds to get 2 litres of water from a mixed tap or shower (probably the highest one in your home) or
  • it takes more than 30 seconds to get 1 litre of water from either the hot or cold tap.
 

What you want to pump

This applies to what type of water you want to pump (hot, cold or both) and what type of/how many outlet (taps, showers toilets etc.) you want to boost.

Twin Pump or Single Pump

In most cases you will be looking to boost both hot and cold water supply within your home, 

  • Twin pumps are designed to supply both hot and cold water to showers, bathroom and whole house installations
  • Single impeller pumps are to supply hot or cold water, either to single or multiple outlets. This can often be when the cold water is mains fed and the hot needs boosted to match this pressure.

Which Bar rating

You can find out what a bar rating is here.

Here is a guide to which type of pump you’ll need to boost the water in your home

I want to boost: Positive Head Negative head
Shower only with a shower head of 100-120mm 1.5 bar twin positive head pump 1.5 bar twin universal pump
Small bathroom and a shower with a shower head of 100-120mm. 2.0 bar twin positive head pump 2.0 bar twin universal pump
Larger bathroom or multiple smaller bathrooms with a shower head of 120mm+ 2.0 bar twin positive head pump 2.0 bar twin universal pump
Multiple bathrooms, 150mm+ shower heads and/or shower with massage function and body jets.  3.0 bar twin positive head pump 3.0 bar twin universal pump


Or to make it a little easier
 

  Products in
Shower only with a shower head of 100-120mm Boost my shower 
Small bathroom and a shower with a shower head of 100-120mm. Boost my Bathroom
Larger bathroom or multiple smaller bathrooms with a shower head of 120mm+ Boost my Bathroom/Boost my House
Multiple bathrooms, 150mm+ shower heads and/or shower with massage function and body jets.  Boost my House


 

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