Wilo-RainSystem AF 400 | Wilo
Your advantages
Wilo-RainSystem AF 400

Your advantages

  • Low-noise due to optimised overall flow and noise concept (multistage centrifugal pumps)
  • Maximum operating reliability through the use of fully electronic RainControl Hybrid controller
  • High economic efficiency due to fresh water replenishment according to requirements
  • Automatic control of the feeding pump
  • System/level control in low-voltage range
  • Tested according to requirements of RAL-GZ 994 quality standard
Series description


Automatic rainwater utilisation system with run-down tanks and 2 non-self-priming pumps


Commercial and industrial rainwater utilisation for conserving drinking water as a hybrid system in conjunction with rainwater storage tanks or vessels


  • Connection-ready module with compact construction
  • Completely connected, electrically and hydraulically, and mounted on vibration-insulated baseplate, comprising:
    • 2 non-self-priming, corrosion-free, low-noise MultiPress series centrifugal pumps
    • R 1 1/2 joint tubing on the pressure side, including transmitter unit with 8-l diaphragm pressure vessel following the flow-through principle and shut-off device with draining, manometer 0–10 bar
    • Ball valve on suction and pressure sides and non-return valve
    • A large-volume hybrid tank with all connections, non-turbulent supply lines and overflow with siphon
    • RainControl Hybrid central switchgear with control electronics, 4–20 mA pressure transmitter and level control in the low-voltage range
    • Signals concerning operation and malfunctions
    • Steady system control by means of cyclical pump cycling and integrated test run on idle pumps
    • Automatic fault-actuated switchover and peak-load cut-in
    • Automatic water exchange in the replenishment reservoir
    • Permanent display of rainwater storage level, system pressure, operating status via LCD (optional)
    • Including DVGW-certified R 1 solenoid valve for the drinking water replenishment



Wilo-AF 400-2 MP 604 DM


Automatic rainwater utilisation and drinking water replenishment system (Aqua Feed)


Nominal content (l) of replenishment reservoir (hybrid tank)


Number of pumps


Non self-priming, horizontal, multistage centrifugal pump of the MultiCargo MP series


Volume flow (m3/h) at optimum efficiency


Number of stages


Three-phase AC motor 3~400 V, 50 Hz

Technical data

  • Max. operating pressure 10 bar
  • Protection class IP54
  • Connections:
    • Pressure pipe/pressure-side joint tubing R 1 ½
    • Inflow pipe HT 50
    • Overflow connection DN 100


  • Pump housing made of 1.4301 stainless steel
  • Impeller made of Noryl
  • Shaft 1.4028 stainless steel
  • Mechanical seal made of ceramic/carbon
  • Stage chambers made of Noryl
  • Diaphragm expansion tank, steel, painted


  • Ready-to-connect water-supply unit with 2 water-supply pumps as compact module for commercial and industrial rainwater utilisation
  • For fully automatic supply with rainwater from ground reservoir or rainwater storage tank using submersible motor pumps as feeding pumps
  • Depending on the pump dimensioning, greater distances between the system and rainwater storage tank can be bridged over with this hybrid system (see also Wilo submersible motor pumps, Wilo-Drain series)
  • High-volume hybrid tank with all integrated functions offers needs-based replenishment of drinking water in the consumer network when rainwater storage tanks are not full.
  • Fully-electronic control unit for controlling the water supply and rainwater storage tank pump, equipped with main switch, control switch for each pump with Manual-0-Automatic function and display of the operating status operation/fault for each pump as well as low-water display
  • Depending on the pressure, pumps are switched on and off in cascade according to the need for water
  • Diaphragm pressure vessel for energy savings in the event of smallest leakages in buildings
  • Steady system control by means of cyclical pump cycling and integrated test run on idle pumps.
  • Automatic fault-actuated switchover and peak-load cut-in guarantee maximum system availability.
  • In the event of low water, the system is switched off by built-in dry-running protection
  • Including integrated electronic motor protection
  • Control device displays extensive signals; it is also equipped with potential-free contacts for collective run signals and collective fault signals
  • System is ideal for connection to building management system (GLT/DDC)

Delivery state

  • Two noise-reduced, non-self-priming, multistage centrifugal pumps
  • 400 l hybrid tank with all required connections, transmitter unit with 8 l diaphragm pressure vessel, central switchgear, RainControl-Hybrid with control electronics and level control device of Wilo-Drain TM or TS rainwater storage tank pumps in three-phase version (optionally in single-phase version) to be ordered separately

Installation and operating instructions

Wilo-RainSystem AF400

Article Number 2515864
Edition 0309
Page format A4
Number of pages 25
PDF (1 MB)

General overview (Documents)

General overview 2019 International version

Article Number 2200591
Edition 2018
Page format 209.9 x 297.0 mm
Number of pages 74
PDF (40 MB)

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 2021-05
Page format 209.9 x 297.0 mm
Number of pages 4
PDF (212 KB)
Product list
Number of results: 3