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Wilo-RAIN1 | Wilo


Rainwater reuse with multiple connection options

Your advantages

Rainwater reuse with multiple connection options

The Wilo-RAIN1 is a rainwater utilisation system for the water supply of e.g. toilet flushing tanks or garden irrigation. Its compact and standardised design according to EN1717 and DIN1989 and its multiple hydraulic connection options make any new installation or replacement easier and faster. Furthermore, the intuitive interface combined with numerous smart functions such as self-protection routines brings convenience and high reliability.

Your advantages

  • Easy installation thanks to its ready-to-plug system and compact design with various hydraulic connection options
  • Convenient operation and simple setting functions thanks to intuitive interface and smart functions
  • High level of reliability thanks to integrated self-protection routines
  • Hygiene safety thanks to non-return valve and a break tank in accordance with DIN 1989 and EN 1717
Series description


Ready-to-plug single-pump rainwater utilisation system


Rainwater utilisation system is designed for applications that do not require drinking water supply such as:

  • Toilets flushing tanks
  • Washing machines
  • Garden irrigation

(Please check that the application complies with local regulations)


Ready for connection module with compact construction, consisting of:

  • HiMulti 3 P self-priming centrifugal pump, mounted on a base frame with vibration absorbers
  • 11 l break tank for fresh water replenishment with float valve
  • 3-way valve
  • Connection on the pressure side, Rp 1" hose
  • Connection on the suction side, Rp 1" hose
  • Connection for municipal water supply network R ¾"
  • 1.5 m mains connection cable and plug
  • Float switch with 20 m cable for rainwater level monitoring in the storage tank
  • Potential-free contact available for optional external alarm or fault message
  • Relay for optional submersible pump (rainwater storage tank pump)
  • Electronic control device with integrated zero flow detection and analogue pressure sensor on the pressure side
  • Operating panel with pushbuttons, 7 segment display and LEDs

Main functions:

  • Fully automatic rainwater utilisation
  • Operating and fault messages
  • Dry-running protection of pump
  • Self-priming support
  • Automatic water replacement break tank
  • Permanent display for the fill level in the rainwater storage tank, system pressure on the pressure side, operating status of the control interface



Technical data

  • Mains connection: 1~230 V, 50 Hz
  • Connection cable: 1.5 m length
  • Protection class: IPX4
  • Motor with integrated thermal motor protection probe
  • Max. operating pressure: 8 bar
  • Triggering pressure: 1.5 bar
  • Max. suction head: 8 m
  • Max. fluid temperature: +5 °C to +30 °C
  • Ambient temperature: +5 °C to +40 °C
  • Break tank volume: 11 litres
  • Nominal connection diameters:
    • Pressure connection Rp 1" thread, union nut
    • Suction connection Rp 1" thread, union nut
    • Connection for municipal water supply network at float valve R ¾" (male thread)


HiMulti 3 P:

  • Pump housing in Technopolymer
  • Impellers and stage casing made of Noryl 30% GF
  • Pump cover and shaft made of stainless steel
  • Mechanical seal made of ceramic/carbon


Ready-to-plug single-pump rainwater-supply unit as compact module for residential and light commercial buildings.

The system fulfils the criteria outlined in DIN 1989 and EN 1717.

All parts that come into contact with the fluid are corrosion resistant.

Scope of delivery

  • Ready-to-connect rainwater utilisation system with fixation material
  • Installation and operating instructions
  • Float switch
  • Sticker ”Do not expose to frost”
  • Sticker ”No drinking water”


  • Rainwater storage tank pump. A submersible pump can be installed in the rainwater storage to overcome pressure losses due to suction distance being too great (depending on installation).
  • External alarm

Installation and operating instructions


Article Number 4232896
Edition 2020-02
Number of pages 92
Language cs, de, el, en, fr, nl
PDF (7 MB)
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