The White International WHI-SK20PPHS2 controllers are devices used to control electric 240V pumps of 1.5kW or less.
The controller monitors both the pressure and the flow. It controls the operation of the pump automatically. Because of its design, there is no need for a separate pressure (expansion) tank, nor is there any need to adjust start and stop pressures as per traditional pressure switches.
The unit will protect the pump should the water supply fail (due to blockage in the pipe or tank running dry) and will automatically restart normal operation once water is restored.