I live in an area where the water pressure is pretty low, and when moving into my house noticed that there was a pump installed to assist the shower in pumping out water - when I turn my shower on, the pump turns on with it. Just purely out of interest - could somebody explain how a pump knows to turn on - in other words, what's its trigger?

  • "what's its trigger" it depends on the pump. It can detect a change in pressure or water flow.
    – Gunner
    Nov 28, 2019 at 20:01
  • @Gunner That looks like an answer, Gunner
    – JACK
    Nov 28, 2019 at 20:33
  • 1
    Thermos, it keeps hot things hot and cold things cold. How does it know?
    – Alaska Man
    Nov 28, 2019 at 22:09

1 Answer 1


"what's its trigger" it depends on the pump. It can start when it detects a change in pressure when you turn on a faucet or flush the toilet, a sensor will detect this drop in pressure. (look up the Bernoulli's principle) It can also start when it detects water flow. In this case, it is usually not a sensor but a vane that moves from the flowing water.

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