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Shower Power Booster


DIY FIT in 3-Steps

Used in over 20,000 UK HOMES

SP21S Two Pump Kit to Double Boost Either Hot or Cold

The easy, efficient & effective way to boost showers & taps


Free Delivery

SP21S pump set - one automatic pump and one slave pump.
  Product Price Quantity Total

Buy from Alan Wright the Inventor on this site

The SP21S pump kit gives a double boost when you have low pressure hot or you have low pressure cold. It is primarily used for boosting mains pressure, unvented hot cylinders, combi boilers and mixed gravity hot and mains pressure cold system.

It is not used for gravity hot and cold systems but if you need to protect and double boost gracity hot and cold to a very demanding tap or shower then two SP21S kits working together will do this (see diagram).

The SP21S is a kit consisting of one automatic SP2B pump and a slave pump to the hot or cold pipe. The two pumps are linked by electrical cables cables so when the automatic flow switch is activated by turning on a tap or shower, both pumps run.

The SP21S comes with free 22mm to 15mm adaptors so you can fit the pumps onto 22mm or 15mm.
It includes a single 3 amp transformer which plugs into a 3 pin socket.
It includes a very detailed fitting guide
You can fit it to boost any pipe by cutting out 110mm of pipe and connecting it with the pumps DIY friendly compression joints.

  • install in 3 easy steps
  • Simplest way to boost showers & taps
  • Completely automatic operation
  • No Cylinder Shower Pump Flange – Works at Any Angle
  • Safe 12V DC – no electrician needed!
  • Unique patented & award-winning design
  • 2 year warranty & 30 day return policy (only if bought on this site)
  • WRAS Approved & British designed & made

Both pumps are single boost pumps which together can add up to 1.0 bars of pressure to a hot or cold pipe.