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 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
  • Control system can be updated via Wifi for Wilo Service

Wilo-RAIN1_Feature 1_EN


Is the new Wilo-RAIN1 range equivalent to the old one? Are the new products covering the same duty points?

  • Wilo-AF Basic MC304 could be replaced by RAIN1-24 or RAIN1-25
  • Wilo-RAIN1-45 is a new version for higher flows in large residential buildings and light commercial

What is the standard scope of supply?

  • Fixation material to hang the system on the wall
  • Operating instructions
  • Float switch with 20m length cable. 30m cable length version available as accessory
  • 2 stickers: ”Do not expose to frost” and ”No drinking water”

Why the overflow funnel is not provided anymore?

The break tank has 2 overflow drains, a flexible hose could be connected directly to the fitting beneath the break-tank to drain overflow water towards waste water. In case of clogging the overflow water can still flow freely through the big opening according to EN1717 standard. The water flooding risk is reduced thanks to this optimized design and the funnel becomes useless.

Is it possible to equip Wilo-RAIN1 with a cover like AF Basic?

No, Wilo-RAIN1 was designed without cover to maximize value for money. If needed, please consider Wilo-RAIN3. Finally Wilo-RAIN3 covers don’t fit on Wilo-RAIN1.

How often the system should be maintained?

Once a year it is recommended:

  • to control the water tightness of the installation.
  • Drain the break tank and clean it.
  • Check the float valve filter and clean/replace it.
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



Wilo-RAIN1-25 EM


Brand name


Rainwater utilisation system


Product level


Nominal flow rate Q in m³/h


Number of impellers



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.

Delivery state

  • 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”


General overview (Documents)

General overview 2021 International version

Edition 2020
Page format 209.9 x 297.0 mm
Number of pages 74
PDF (10 MB)

Certificate REACH (Documents)

REACH regulation

Edition 2020-08
Page format 209.9 x 297.0 mm
Number of pages 2
PDF (158 KB)
Product list


Number of results: 3