Submersible pumps with float switch

If the pump is left unattended, you want it to start and stop by itself. Three ways: a mechanical float, which needs room to tilt, an electronic sensor for tight spaces, or an electrode float you set to the millimetre.

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A pump that switches itself on and off

If the pump is left unattended — in a cellar, a crawl space, a pump sump or a garage — you want it to start by itself when the water comes and stop when it has gone. Without switching, a pump runs dry, and running dry is the quickest way to destroy one.

Three types of switching

  • Mechanical float. A float on a cable. Simple and reliable, but it needs room to tip: allow for a sump of at least about 40 cm across.
  • Electronic sensor. Detects water without moving parts. Works in tight spaces and switches at a lower level.
  • Electrode float. Two electrodes that you set yourself, accurate to the millimetre. It does need cleaning twice a year.

A separate switch on an existing pump is also possible: see the separate float switches or the control systems. For a critical installation we also recommend a high water alarm: a pump can fail, and then you want to know before the water does damage.