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RAIN3-25 EM | Wilo
Technical data
Tender text

Wilo-RAIN3 is a rainwater utilisation system for conserving drinking water, for the water supply of, for example, WC cisterns or for garden irrigation. Its compact and standardised construction in accordance with EN 1717 and DIN 1989 and its numerous hydraulic connection options speed up and simplify every new installation or replacement. In addition, the intuitive interface of the touch LCD combined with numerous smart functions such as self-protection routines ensure convenient operation and high reliability.

Special features/product benefits

- Easy installation thanks to ready-to-plug system and compact construction with various hydraulic connection options

- Convenient operation and simple setting functions thanks to a unique combination of intuitive LCD touchscreen operation and a multitude 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

- Easy maintenance with direct access to system components

- Quiet operation in installation close to living space


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

- Electronic control device with colour LCD touchscreen


- Colour LCD touchscreen with display

- Permanent display for the fill level in the rainwater storage tank, system pressure on the pressure side, operating status of the control interface

- Logging of the last 10 faults


Fully automatic control of:

- HiMulti 3 P self-priming centrifugal pump

- Configurable triggering pressure

- Operating modes of the systems (manual or automatic)

- 3-way valve switchover between rainwater operation and municipal water supply network

- Level monitoring of the rainwater storage tank

- Break tank overflow detection

- Dry-running protection of pump

- Self-priming support

- Automatic water replacement break tank

- Operating and fault messages

- Optional external alarm or fault message

- Optional submersible pump (rainwater storage tank pump)


- Rainwater fill level in storage tank thanks to 4…20 m filling level sensor

- Current supply pressure

- Dry-running protection of pump

- Continuous monitoring of sensor cables

- Protection of pump mains voltage supply via circuit breaker

- Break tank overflow


- Relay for optional submersible pump

- Potential-free contact available for external alarm or fault message to BMS

- Potential-free contact for sensor for overflow or backflow detection

Optional accessories

- 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

Pump housing PA6T/6I-GF40
Shaft Stainless steel
Impeller PPE/PS-GF30
Operating data
Max. delivery head H 8 m
Min. fluid temperature Tmin 3 °C
Max. fluid temperature Tmax 30 °C
Maximum operating pressure p 8.0 bar
Max. ambient temperature Tmax 40 °C
Motor data
Mains connection 1~230 V, 50 Hz
Rated speed n 2900 1/min
Rated current IN 3.3 A
Protection class motor X4
Insulation class F
Installation dimensions
Overflow connection Ø75-PN0
Pipe connection on the suction side DNs G 1
Pipe connection on the discharge side DNd G 1
Ordering information
Net weight, approx. m 26 kg
Brand Wilo
Product description RAIN3-25 EM
Article number 2551472

Installation and operating instructions


Article Number 4232897
Edition 2020-02
Page format 209.9 x 297.0 mm
Number of pages 132
PDF (9 MB)


Article Number 4232897
Edition 2020-02
Page format 209.9 x 297.0 mm
Number of pages 132
PDF (13 MB)

Certificate REACH (Documents)

REACH Regulation

Edition 2021-05
Page format 209.9 x 297.0 mm
Number of pages 4
PDF (212 KB)