RAIN1-25 EM | Wilo
Technical data
Tender text

Wilo-RAIN1 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 control unit combined with numerous smart functions such as self-protection routines ensure convenient operation and high reliability.

Special features/product benefits

- Drinking water savings

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

- Convenient operation and simple setting functions thanks to an intuitive interface and a multitude of functions

- High level of reliability thanks to integrated self-protection routines

- Hygiene safety thanks to non-return valve and break tank in accordance with DIN 1989 and EN 1717

- Easy maintenance with direct access to system components


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

- 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

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


Fully automatic control of:

- HiMulti 3 P self-priming centrifugal pump

- Configurable triggering pressure

- Operating modes of the system (manual or automatic)

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

- Level monitoring of the rainwater storage tank

- 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 (cistern pump)


- Rainwater fill level in storage tank thanks to flow switch

- Current supply pressure

- Dry-running protection of pump

- Continuous monitoring of sensor cables

- Protection of pump mains voltage supply via circuit breaker


- Relay for optional submersible pump

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

Optional accessories

- Cistern 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

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 22 kg
Brand Wilo
Product description RAIN1-25 EM
Article number 2551469

Installation and operating instructions


Article Number 4232896
Edition 2020-02
Page format 209.9 x 297.0 mm
Number of pages 92
PDF (7 MB)

Certificate REACH (Documents)

REACH Regulation

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