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Wilo-FLA Compact-1 Helix V | Wilo
Your advantages
Wilo-FLA Compact-1 Helix V

Your advantages

  • Compact system with one Helix FIRST V series stainless steel high-pressure multistage centrifugal pump, in accordance with DIN 1988 and DIN 14462 (redundancy for 2-pump systems)
  • Complete system which is supplied with a round tank (approved for drinking water) connected directly to the suction port of the pump
  • Hydraulic power within the series of up to 18 m3/h for 100 m delivery head
  • Easily adjustable and operationally reliable due to the FLA operating unit (TÜV tested)
  • Preconfigured bypass flow, for pump protection with low flow
Series description


Pressure-boosting system for firefighting in accordance with DIN 14462 for indirect connection.

With a vertical, stainless steel high-pressure multistage centrifugal pump in glanded version and break tank.


Fully automatic water supply for fire-fighting systems with type "F" fire hose reels in domestic, commercial and public buildings, hotels, hospitals, shopping centres and industrial systems


  • One Helix FIRST V 16, 22 series pump, equipped with IE3 motors
  • Automatic pump control via FLA control unit
  • Components that come in contact with the fluid are corrosion-resistant
  • Base frame made of galvanised steel, with height-adjustable vibration absorbers for insulation against structure-borne noise
  • Pipework made of 1.4301 stainless steel
  • Shut-off ball valve on the discharge side
  • Gate valve between pump and break tank
  • Non-return valve, on the discharge side
  • Preset valve at pump outlet for minimum bypass flow
  • Pressure switch, on the discharge side
  • Pressure gauge, on the discharge side
  • Diaphragm pressure vessel 8 l, PN 16, on the discharge side
  • Atmospherically ventilated break tank in accordance with DIN 14462 with free exhaust in accordance with EN 13077, type AB in accordance with DIN EN 1717
  • Round PEHD tank with water level indicator
  • Drainage
  • Float switch as low-water signal transmitter
  • Venting and exhaust with valve plate
  • Inspection opening with cover, which can be sealed without any tools
  • Internal wash plates to reduce the flow rate of the fluid
  • Inlet, draw-off connection
  • Overflow as free outlet, type AB in accordance with DIN EN 1717 with non-circular cross-section



Wilo-FLA Compact–1 Helix V 1604 DS8


Fire extinguishing system


with break tank


Number of pumps

Helix V

Pump series


Rated volume flow [m3/h]


Number of pump stages


Pressure control up to 8 bar (pump type-dependent)

Technical data

  • Mains connection 3~400 V, 50 Hz
  • Max. fluid temperature 50 °C
  • Rated pressure 16 bar
  • Operating pressure up to 16 bar
  • Inlet pressure from break tank < 1 bar
  • Nominal connection diameter on the pressure side R 11/2" - R 2"
  • Nominal connection diameter of the float valve in the break tank G2"
  • Operating unit protection class IP 54
  • Round break tank (540 l)


  • Impellers, diffusers, stage housing made of stainless steel 1.4307
  • Pump housing made of EN-GJL-250, cataphoretically coated
  • Shaft of stainless steel 1.4057
  • 1.4404 shaft protection sleeve
  • O-Ring gaskets made of EPDM (FKM gasket on request)
  • Round tank made of black PE-HD
  • Pipework made of 1.4301 stainless steel


  • Base frame: made of electrolytically galvanised steel and provided with height-adjustable vibration absorbers for comprehensive insulation against structure-borne noise; other versions on request
  • Pipework: complete pipework made of stainless steel 1.4301, suitable for the connection of all conventional piping materials; the pipework is dimensioned according to the overall hydraulic performance of the FLA pressure boosting system
  • Pumps: Helix FIRST V 16, 22 series pumps; all pump components in contact with fluid are made of stainless steel/EN-GJL-250, with cataphoretic coating. For more information about the pump, please refer to the catalogue section "High-pressure multistage centrifugal pumps"
  • Valves: A special brass valve is located at the upper end of the hydraulic section of the pump for returning a bypass volume flow to the break tank. This valve and the shut-off devices are sealed and protected against unauthorised adjustment.
  • Diaphragm pressure vessel: 8 l/PN 16 arranged on the discharge side. For testing and inspection purposes, equipped with a special throughflow fitting that enables the diaphragm pressure vessel to be shut-off and drained
  • Pressure switch: A pressure switch arranged on the discharge side, for activation of the central FLA controller
  • Pressure indication: Pressure gauge (ø 63 mm) on the discharge side; additional digital display of operating pressure and setting parameters in the FLA controller
  • Control device/controller: The system is equipped with a specific FLA controller as standard
  • Break tank: The system is supplied with a break tank (540 l). This is equipped with a float valve and a specific spray water device approved for drinking water to ensure compliance with the Drinking Water Ordinance

Scope of delivery

  • Factory-mounted, connection-ready pressure boosting system checked for functionality and impermeability
  • Break tank ready for connection
  • Installation and operating instructions

Consulting guide

Low-water cut-out switchgear

According to DIN 14462, dry-running protection relay, e.g. for connection to low water float switches of the WILO FLA break tanks, electrodes etc.; low water status only for signalling of faults. Protection against low water level is active in the test run. The contacts of the necessary float switch must be wired to the connecting terminals in the controller.

Atmospherically ventilated break tank according to DIN 14462, for indirect connection of a fire extinguishing system to the public drinking water supply according to DIN 1988-600, system separation provided by a safety device in accordance with EN 13077 (free outlet), type AB in accordance with DIN EN 1717.

When using, please observe DIN 1988 - 600 and the regulations of the local water suppliers.


Onsite connection lines are to be connected in such a way that they are voltage-free and not weight-loaded!


Installation and operating instructions

Wilo-Helix V, .. FIRST V, ..2.0-VE 2-4-6-10-16

Article Number 4143727
Edition 2023-03
Number of pages 24
PDF (5 MB)

Wilo-Helix V, FIRST V, 2.0-VE 22-36-52

Article Number 4120943
Edition 02/2022
Number of pages 28
PDF (7 MB)

Wilo-FLA Compact

Article Number 2537431
Edition 2019-07
Number of pages 96
PDF (4 MB)

General overview

General Overview 2024 - International version

Edition 2024
Number of pages 74
PDF (33 MB)