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Wilo-RAIN3 | Wilo


Rainwater utilisation via touchscreen.

Your advantages

Rainwater utilisation via touchscreen.

The Wilo-RAIN3 is a rainwater utilisation system in accordance with EN 1717 and DIN 1989 standards. Its compactness and versatile hydraulic connection options mean that initial commissioning or replacement is quick and straightforward.

What’s more, it is also extremely convenient and highly reliable thanks to the intuitive user interface of the touch LCD in connection with various intelligent functions such as the self-protection routine.

Your advantages

  • Easy installation thanks to its ready-to-plug system and compact design with various hydraulic connection options
  • A unique combination of intuitive LCD touch screen operation and a wide range of control functions facilitate convenient operation and easy-to-use settings
  • High level of reliability thanks to integrated self-protection routines
  • Non-return valve and replenishment reservoir in accordance with DIN 1989 and EN 1717 ensure hygienic safety
  • Quiet operation in installations close to living space
  • Controls can be conveniently updated by Wilo Service via Wi-Fi
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 oscillation absorbers
  • 11 l replenishment reservoir for fresh water replenishment with float valve
  • 3-way valve
  • Front and rear cover
  • Connection on the discharge side, G 1″ hose
  • Connection on the suction side, G 1″ hose
  • Connection for municipal water supply network: G ¾″
  • 3 m mains connection cable and plug
  • 4 … 20 mA filling level sensor with 20 m cable for rainwater level monitoring in the storage tank
  • 4 … 20 mA pressure sensor
  • Overflow sensor installed in the replenishment reservoir
  • Acoustic alarm
  • Potential-free contact available for optional external alarm or fault message
  • Relay for optional submersible pump (rainwater storage tank pump)
  • Electronic control device
  • Colour LCD touchscreen

Main functions:

  • Fully automatic rainwater utilisation
  • Run signals and fault messages
  • Logging of the last 10 faults
  • Dry-running protection of pump
  • Self-priming support
  • Automatic water replacement replenishment reservoir
  • 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: 3 m length
  • Protection class: IPX4
  • Motor with integrated thermal motor protection probe
  • Max. operating pressure: 8 bar
  • Triggering pressure: 1.5 bar
  • Max. negative suction head: 8 m
  • Max. fluid temperature: +5 °C to +30 °C
  • Ambient temperature: +5 °C to +40 °C
  • 11 l replenishment reservoir volume
  • Nominal connection diameters:
    • Discharge port: G 1″ thread, union nut
    • Suction port: G 1″ thread, union nut
    • Connection for municipal water supply network at float valve: G 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
  • 4 ... 20 mA level sensor
  • 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
  • Sensor for overflow or backflow detection

Installation and operating instructions


Article Number 4232897
Edition 2023-10
Page format 209.9 x 297.0 mm
Number of pages 132
PDF (17 MB)

Wilo-RAIN3 - Quick Start Guide

Article Number 4263496
Edition 2023-08
Page format 297.0 x 209.9 mm
Number of pages 16
PDF (10 MB)

General overview

General Overview 2023 - International version

Edition 2022
Page format 209.9 x 297.0 mm
Number of pages 74
PDF (24 MB)

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