• The MHR20 Series is a fully Automatic Hydraulic Rain / Mains water changeover device designed for pressure pump supply systems in harvesting rainwater for the toilet, laundry and household applications with automatic mains backup.
  • The MHR20 Valve is designed to operate with an electronic pressure controller with auto-restart not requiring a float switch. This design makes the MHR20 System very simple to install.
  • The MHR20 Valve comes with 3/4” outlet, which makes the system ideal for domestic applications. Certified to: WaterMark ATS 5200.477 WMK 60075 Complies with AS/NZS 3500.1 when installed by a licensed plumber.

  • Note: Should the static mains supply be greater than 400 kPa above the supply pressure of the pump the device will not completely isolate mains water.


  • Pump body: AISI 304 Stainless steel
  • Impeller: Stainless steel
  • Motor Shaft: Stainless steel
  • Mech seal: Ceramic / Graphite / NBR



  • Max mains pressure 500 KPa
  • Max pump pressure 600 KPa
  • Flow rate >50 LPM
  • Max Water Temperature 40C
  • Rainwater Inlet 25mm 1” BSP F
  • Mains Water in 20mm 3/4” BSP F
  • Outlets 20mm 3/4” BSP F


Pump Model Description Power Head Flow Outlets Applications
(kW) (m) (L/min)
MHR20-370 HYJET Hydraulic Rain/Mains System with HSJ370 Pressure Pump 0.37 36 55 3 Single Storey
MHR20-550 HYJET Hydraulic Rain/Mains System with HSJ550 Pressure Pump 0.55 38 70 4 Double Storey


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