The pump kit gives a double boost when you have low pressure hot or you have low pressure cold. It is primarily used for mains pressure systems but it is great for a gravity hot and cold system when need to protect and boost the hot and cold to a very demanding tap or shower.
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.
- DIY 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 can add up to 1.0 bars of pressure to a hot or cold pipe.
For very demanding showers and taps which need mains pressure on the hot and the cold we recommend two SP21S.
