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 ready-to-plug system and compact design with various hydraulic connection options
  • Convenient operation and easy setting options thanks to a unique combination of intuitive LCD touch screen operation and a wide range of functions
  • High level of reliability thanks to integrated self-protection routines
  • Hygiene safety thanks to a break tank with safety device in accordance with DIN 1989 and EN 1717
  • Quiet operation in installations close to living space
  • Control system can be updated via Wifi for Wilo Service

Wilo-RAIN3_Feature 3_EN
Wilo-RAIN3_Feature 4_EN


Is the new Wilo-RAIN3 series equivalent to the old one? Are the new products covering the same duty points?

  • Wilo-AF Comfort MC304 can be replaced by Wilo-RAIN3-24
  • Wilo-AF Comfort MC305 can be replaced by Wilo-RAIN3-25
  • Wilo-RAIN3-45 is a new version for higher volume flows in large residential buildings and light commercial

What is the standard scope of delivery?

  • Fixation material to hang the system on the wall
  • Operating instructions
  • 4.20mA level sensor 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 can be connected directly to the fitting beneath the break tank to drain overflow water towards wastewater. 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 optimised design and the funnel becomes useless.
Wilo-RAIN3 has an overflow switch installed by default to warn the user if an overflow is detected in the break tank.

How often should the system be maintained?

Once a year it is recommended to:

  • Check 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
  • Front and rear cover
  • 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
  • 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 break tank
  • 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
  • Operating and fault messages
  • Logging of the last 10 faults
  • 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

Scope of delivery

  • Ready-to-connect rainwater utilisation system with fixation material
  • Installation and operating instructions
  • 4..20mA level sensor
  • Sticker ”Do not expose to frost”
  • Sticker ”No drinking water”

Type key


Wilo-RAIN3-25 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.


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
Product descriptionMains connectionRated power P2Gross weight, approx. mArticle number