WEV-2-307-T/CE | Wilo
Technical data
Tender text

Compact pressure-maintaining system delivered as unit ready for connection, enabling easy installation and commissioning. System consisting of mechanical and hydraulic components as well as control units: Pumps, PPH container, collective pipework and the corresponding equipment, such as: stop valves, connection pipes, 2 overpressure valves, cartridge filters and non-return valves, venting unit for mechanical seal of the pumps, pressure sensors, switchgear for the pumps. The connection between pumps and container, the pressure side and the system provided by the customer and the electrical power supply must still be made.

Wilo-WEV is used to ensure constant and stable pressure in the system. Upon expansion, the fluid is collected in the container and upon contraction it is returned to fill the system.

For installation in commercial properties (office buildings, hotels, hospitals, shopping centres, schools,...) and heating and air conditioning systems for district heating.


Switchgear/control device

Fully-electronic central control unit

  • Plastic housing with protection class IP 54, with main switch
  • Individual run signals and fault signals
  • Configurable parameters for setting the pressure
  • With function for filling the pumps


The MVIL-series multistage pumps provide the currently required volume flow and pressure in order to maintain stable pressure at the required level in the system. They can also be used in hot water heating systems, cooling and cold water cycles as well as in industrial circulation systems. For the vertical versions with the MVIL pumps, it is possible to vent the mechanical seal on an ongoing basis.


The container is available in sizes 200 l - 5000 l and is made of polypropylene homopolymer with excellent resistance to corrosion. All required connections are prepared. A solenoid valve for filling the container is attached to the container. Furthermore, a level float switch and a float switch for low-water monitoring is attached to the container. A cover with a handle is attached to the top of the container.

Joint tubings

Two collective pipeworks are installed, one each on the pressure and suction side. Two overpressure valves are installed between the collective pipeworks. If the pressure of the fluid increases due to expansion, the overpressure valves open to allow the fluid to flow from the system back into the container. A stop valve and a filter cartridge are installed on the suction side. A non-return valve and a stop valve are installed on the pressure side. A pressure sensor is installed for monitoring of the system pressure. If the system pressure falls, the sensor recognises this and starts the pump in order to pump the fluid from the container back into the system, increasing the pressure to its setpoint.

Technical data
Height H 1150 mm
Length L 685 mm
Net weight, approx. 93 kg
Width W 510 mm

Installation and operating instructions

Wilo-WEH / WEV

Article Number 4158278
Edition 2021-09
Page format 209.9 x 297.0 mm
Number of pages 16
PDF (2 MB)

Certificate REACH (Documents)

REACH Regulation

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

4157271, WEV-2-307-T/CE

DWG (3 MB)

4157271, WEV-2-307-T/CE

STP (4 MB)

4157271, WEV-2-307-T/CE

DWG (84 KB)

4157271, WEV-2-307-T/CE

DWG (56 KB)

4157271, WEV-2-307-T/CE

DWG (56 KB)