Our WHI automatic controller system suits all single phase pumps of 0.37, 0.55, 0.75 and 1.1 kW with a closed head of less than 10 Bar or 100m.   The WHI provides automatic ON/OFF operation in response to pressure drop and flow while also providing some protection against running the pump dry.   Terrific for a smaller bore when you only need a flow of less than 50 litres per minute into a tank or an irrigation system.   Again, this unit is supplied pre-assembled and tested ready for site installation.