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£210.00 incl. VAT


4 reviews

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Shower Pressure Booster Pump - Double Automatic Pack Details

Balance Gravity Fed Hot & Cold Systems with this In Line Micro Pump set from Flowflex. A compact and powerful pump set, it can be retro fitted to any shower, tap or hot water system to boost water pressure or flow.

This configuration supplies a double automatic pump pack and offers the easiest and complete solution to boost both your hot and cold supply on a gravity fed system. Installing this pump on both the hot & cold feeds will give the system a boost but also keep the pressure balanced, stopping issues with fluctuations in water pressures or temperatures.

The In Line Micro Pump can be fitted into existing pipework in minutes by any DIY enthusiast. It uses a fraction of the energy used by other comparable pumps and can be powered from any household socket. No electrician required.

Key Features

  • Min Flow Rate: 1.8 Litres/min
  • Max Flow Rate: 9 Litres/min
  • Works underwater
  • Works under negative head
  • WRAS Approved
  • Quiet and compact
  • Easy to install
  • No Electrician required
  • Uses 5% energy of conventional shower pumps
  • Unique patented & award winning design

What's In The Box

  • 2 x Fully Automatic Pumps
  • 2 x 22mm x 15mm Reducing Sets
  • 1 x 5 Amp Transformer
  • 3 Way Cable (to link power)
  • Instruction Manual


Unless stated, all measurements are in millimetres (mm)
After Combi Boiler Compatible True
Applications Gravity Systems, Positive & Negative Head, Mixed Systems, Mains Feed, Electric Showers, Combi Boilers, Megaflows, Radiators, Taps Hot and/or Cold
Backflow Prevention True
Electrical Input 240 Volts
Electrical Output 12 Volts DC
Finish Nickel Plate
Fuse Rating 3 Amps
Individual Outlet Compatible True
Inline Shower Pump True
Manufacturer Guarantee 2 Years
Material Brass
Maximum Flow Rate 9 L/min
Maximum Head Pressure 6m
Maximum Sustained Pressure 4 Bar
Maximum Sustained Temperature 85°C
Minimum Flow Rate 1.5 L/min
Mounting Style Inline
Negative Head Pump True
Power Rating 12.6 Watts @ 5 L/min
Shower Compatible True
Tap Booster Compatible True
Twin Impeller True
Typical Operating Output 5 L/min @ 3.2m
WRAS Approved True
Whole Bathroom Compatible True
Whole House Compatible True


In order to provide you with the best service, we use a range of courier services which helps us ensure that your delivery reaches you in the fastest time and in perfect condition.

Deliveries will not be made on bank holidays, so please allow extra time for your order to arrive during these times, especially throughout the Easter and Christmas periods. For all information regarding our Shipping Policy, please read here.

For PHQ100120 we have the following delivery aim:

Order Cut Off Time
Standard Delivery Time (Days)


PlumbHQ offers a simple 30 day returns policy. If you're not completely satisfied with your purchase, you may return it within 30 days.

Before initiating a return, it is really important that you make contact with our customer service team so that we can issue you with the correct returns instructions for your item. You can do this via the chat or simply call us on +44 (0) 1639 352 997. We are available Monday to Friday 0900 - 1700.

Any items returned without having made contact with our team may suffer unwanted delays and extra charges. Full details of our returns policy can be found here.


In the checkout, simply choose "Klarna" as your payment option. Follow the steps and provide the information they require to complete your credit application.

If it's your first time with Klarna, you will likely have to read and sign a contract document. When this is approved, Klarna will set up an account for you.

All future orders can now be financed in one click!

Customer Reviews

4.25 out of 5 stars

Based on 4 reviews

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Recent Reviews


5 out of 5 stars

More than doubled the flow rate on my gravity shower as my head of water is less than a metre.


5 out of 5 stars

Not a great deal of pressure with the aqualisa head but did increase the volume from 5 lpm to 10 lpm

M Reppion heating & Plumbing Services

5 out of 5 stars

Fantastic product fit a few times now and had no complaints,