Helix2.0-VE216-1/25/E/KS/3
| Hydraulic data | |
|---|---|
| Minimum efficiency index (MEI) | ≥0.7 |
| Maximum inlet pressure p inl | 10 bar |
| Maximum operating pressure PN | 25 bar |
| Discharge port | DN 25 |
| Min. fluid temperature Tmin | -30 °C |
| Max. fluid temperature Tmax | 120 °C |
| Min. ambient temperature Tmin | -15 °C |
| Max. ambient temperature Tmax | 50 °C |
| Motor data | |
|---|---|
| Mains connection | 3~380 V, 50/60 Hz |
| Voltage tolerance | 400/50:+/-10%, 380/60:+/-10%, 440/60:+/-10% |
| Rated power P2 | 2.2 kW |
| Motor efficiency class | IE5 |
| Rated current IN | 3.9 A |
| Power consumption P1 max | 2470 W |
| Activation type | Softstart |
| Motor efficiency 100% ηM 100% | 93.3 % |
| Insulation class | F |
| Protection class motor | IP55 |
| Materials | |
|---|---|
| Cartridge | Cartridge mechanical seal |
| Pump housing | Stainless steel |
| Impeller | Stainless steel |
| Shaft | Stainless steel |
| Mechanical seal | BQ1EGG |
| Gasket material | EPDM |
| Installation dimensions | |
|---|---|
| Pipe connection on the suction side DNs | DN 25 |
| Pipe connection on the discharge side DNd | DN 25 |
Wilo-Helix2.0-VE 2&4 m³/h round flange
3~ 380 V...440 V, 50/60 Hz
| Product data | |
|---|---|
| Brand | Wilo |
| Product description | Helix2.0-VE216-1/25/E/KS/3 |
| Article number | 4250671 |
| EAN number | 4062679217611 |
| Colour | Green/black/silver |
| Minimum order quantity | 1 |
| Date of sales availability | 2022-05-01 |
| Packaging | |
|---|---|
| Packaging type | One-way pallet |
| Packaging property | Transport packaging |
| Pieces per pallet | 1 |
| Number per layer | 1 |
| Dimension, weight | |
|---|---|
| Length with packaging | 1200 mm |
| Length L | 365 mm |
| Height with packaging | 600 mm |
| Height H | 1100 mm |
| Width with packaging | 400 mm |
| Width W | 268 mm |
| Gross weight, approx. m | 54.8 kg |
| Net weight, approx. m | 47 kg |
Highly efficient, non-self-priming, high-pressure multistage centrifugal pump in vertical design with in-line connection, equipped with electronically controlled EC motor with energy efficiency class IE5 according to IEC 60034-30-2.
The pump and motor shafts are connected via clamp coupling. A special lantern ball bearing ensures optimum admission of axial thrusts. Special, built-in lifting eyes allow the pump to be easily installed.
The pump is suitable for the water supply, water distribution and pressure boosting, for industrial circulation systems, process water, closed cooling circuits and heating applications. It can also be used in washing systems as well as for irrigation.
Control modes:
- Constant speed n-c: manually with the green button or using an external signal
- Constant pressure p-c, constant differential pressure ∆p-c, variable pressure p-v, variable differential pressure ∆p-v: Pressure control via sensor, setpoint configuration with the green button or using the external signal
- PID control: Other constant control variables (temperature, volume flow, pressure etc.) with sensor, setpoint configuration with the green button or using the external signal
The electronic module offers various functions:
- Maximum pressure for limit detection
- Minimum pressure for limit detection
- Low-water detection through suction sensor
- Zero-flow test (open circuit)
- No-Flow Stop (closed circuit)
- Dry-running detection
- Calculation of the volume flow with the help of a differential pressure sensor
- Pump kick
- Error and warning codes
- Overload protection
- Slot for Wilo CIF module PLR, LON, BACnet MS/TP, Modbus RTU, CANopen, Ethernet Multi-protocol (Modbus TCP, BACnet/IP) for connection to the building automation
- A green LED indicates pump status
- A blue LED indicates that the pump is controlled externally via an interface
- Access barrier
Analogue input:
- IN (AI 1): Input, sensor signal 4–20 mA, 0–10 V, 0–20 mA or 2–10 V
- IN (AI 2): Input, setpoint 0–20 mA, 0–10 V, 4–20 mA or 2–10 V
Digital input IN (DI 1):
- External OFF
- Low-water detection due to binary input
Dual pump management (two single pumps)
- Main/standby operation
- Pump replacement in main/standby operation after 24 hours or automatic fault-actuated switchover
- Wired connection via Wilo Net
Special features/Product advantages
- IE5 EC motor and integrated frequency converter combined with highly efficient Helix hydraulics
- 2" LCD colour display, Wilo Green Button Technology and soft button with back function. The well-arranged pump menu allows the pumps to be conveniently set up.
- Analogue and digital interface and CIF module
- Intelligent control with different control modes including integrated dual pump management
- Efficiency-optimised, laser-welded and highly efficient 2D/3D hydraulics (with volume flow and degassing optimisation)
- Corrosion-resistant impeller, guide vane and stage housing
- Hydraulics with volume flow and degassing optimisation
- Pump housing optimised for volume flow and NPSH
- Easy maintenance design
- Drinking water approval for pumps with parts made of stainless steel that come into contact with the fluid (EPDM version)
Scope of delivery
- Helix2.0-VE high-pressure multistage centrifugal pump
- Installation and operating instructions
- Helix2.0-VE 2 – 16 (PN 16 version with oval flange): Stainless steel counter flanges with the corresponding screws, nuts and gaskets
Notes on the design
- Depending on the version, the Helix2.0-VE series is equipped with a user-friendly mechanical gasket (X-Seal) in cartridge design as well as a standard gasket for easy maintenance or a standard mechanical seal.
- For PN 16 and PN 25 version pumps, round counter flanges made of grey cast iron or stainless steel, screws, nuts and gaskets are available as accessories.
- The spacer coupling enables the mechanical seal to be replaced quickly and easily without removing the motors (from 5.5 kW and higher).
- Optional plug-in Wilo CIF modules PLR, LON, BACnet MS/TP, Modbus RTU, CANopen, Ethernet Multi-protocol (Modbus TCP, BACnet/IP) for connection to the building automation
- Optional connection for M12 RJ45 CIF Ethernet
- Sensors are available as accessories: Differential pressure set 4–20 mA and relative pressure set 4–20 mA
- Bypass kits are available as accessories
| Operating Data |
|---|
| Product data | |
|---|---|
| Min. fluid temperature Tmin | -30 °C |
| Max. fluid temperature Tmax | 120 °C |
| Max. ambient temperature Tmax | 50 °C |
| Maximum operating pressure PN | 25 bar |
| Maximum inlet pressure p inl | 10 bar |
| Minimum efficiency index (MEI) | ≥0.7 |
| Motor data | |
|---|---|
| Electromagnetic compatibility | EN 61000-6-1, -2, -3, -4 |
| Mains connection |
|
| Voltage tolerance | 400/50:+/-10%, 380/60:+/-10%, 440/60:+/-10% |
| Rated power P2 | 2.2 kW |
| Motor efficiency class | IE5 |
| Rated current IN | 3.9 A |
| Insulation class | F |
| Protection class | IP55 |
| Materials | |
|---|---|
| Pump housing | Stainless steel |
| Impeller | Stainless steel |
| Shaft | Stainless steel |
| Shaft seal | BQ1EGG |
| Gasket material | EPDM |
| Installation dimensions | |
|---|---|
| Pipe connection on the suction side DNs | DN 25 |
| Pipe connection on the discharge side DNd | DN 25 |
| Ordering information | |
|---|---|
| Brand | Wilo |
| Product description | Helix2.0-VE216-1/25/E/KS/3 |
| Net weight, approx. m | 47 kg |
| Article number | 4250671 |
Installation and operating instructions
Drive for Wilo-Helix2.0-VE / Wilo-Medana CH3-LE
| Article Number | 4254674 |
| Edition | 2024-02 |
| Number of pages | 100 |
PDF (8 MB)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)In inlet mode (7) | |||
Stainless steel threaded flange (female thread), round, for connecting pumps to the system pipework. Scope of delivery
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Welding steel flange for connecting pumps to the system pipework. Scope of delivery
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For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
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Signal transmitter kit, 0 up to 16 bar | 2516557 | ||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
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Signal transmitter kit, 0 up to 25 bar | 2516558 | ||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
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Signal transmitter kit, 0 up to 40 bar | 2516559 | ||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
| |||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
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Bypass line (1) | ||
The use of bypass lines is always appropriate when the fluid contains large amounts of air or oxygen components or otherwise tends to emit gases. As a result of the recirculation between pump head and pump suction side, an accumulation of air and/or oxygen is permanently discharged in the area of the mechanical shaft seal. Typical areas of application are e.g. pumping condensate or pressure boosting with pumping from atmospherically ventilated break tanks. Scope of delivery The set includes all components required for constructing the complete bypass line. | ||
Pipe installation (2) | ||
Stainless steel threaded flange (female thread), round, for connecting pumps to the system pipework. Scope of delivery
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Welding steel flange for connecting pumps to the system pipework. Scope of delivery
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Pump control/interface module (7) | |||
Interface module as retrofittable plug-in module for extending the communication interfaces of the pump in accordance with various standards and protocol variants according to type key. General functions Serial, digital interface for connection to building automation for the transfer of data points as:
Equipment RS485 interface with BACnet MS/TP protocol Information about the download http://www.wilo.de/automation (German) http://www.wilo.com/automation (English) Scope of delivery
Bus lines (shielded!) must be provided by the customer | |||
CIF-Module Modbus RTU | 2190368 | ||
Interface module as retrofittable plug-in module for extending the communication interfaces of the pump in accordance with various standards and protocol variants according to type key. General functions Serial, digital interface for connection to building automation for the transfer of data points as:
Equipment RS485 interface with Modbus RTU protocol Information about the download http://www.wilo.de/automation (German) http://www.wilo.com/automation (English) Scope of delivery
Bus lines (shielded!) must be provided by the customer | |||
CIF-Module CANopen | 2190369 | ||
Interface module as retrofittable plug-in module for extending the communication interfaces of the pump in accordance with various standards and protocol variants according to type key. General functions Serial, digital interface for connection to building automation for the transfer of data points as:
Equipment CAN 2.0A interface with CANopen protocol Information about the download http://www.wilo.de/automation (German) http://www.wilo.com/automation (English) Scope of delivery
Bus lines (shielded!) must be provided by the customer | |||
CIF-Module LON | 2190370 | ||
Interface module as retrofittable plug-in module for extending the communication interfaces of the pump in accordance with various standards and protocol variants according to type key. General functions Serial, digital interface for connection to building automation for the transfer of data points as:
Equipment TP-FT 10 interface with LonTalk protocol Information about the download http://www.wilo.de/automation (German) http://www.wilo.com/automation (English) Scope of delivery
Bus lines (shielded!) must be provided by the customer | |||
CIF-Module PLR | 2190371 | ||
Interface module as retrofittable plug-in module for extending the communication interfaces of the pump in accordance with various standards and protocol variants according to type key. General functions Serial, digital interface for connection to building automation for the transfer of data points as:
Equipment PLR interface (WILO) Information about the download http://www.wilo.de/automation (German) http://www.wilo.com/automation (English) Scope of delivery
Bus lines (shielded!) must be provided by the customer | |||
Interface module as retrofittable plug-in module for extending the communication interfaces of the pump by an Ethernet network connection. BACnet IP and Modbus TCP protocols can be selected in the configuration. General functions Network interface for connection to building automation for the transfer of data points as:
Equipment Ethernet interface with Modbus TCP and BACnet IP protocol Information about the download http://www.wilo.de/automation (German) http://www.wilo.com/automation (English) Scope of delivery
Network cable (shielded!) must be provided by the customer | |||
REG device to establish communication between Wilo products with Wilo Net and the Wilo-Smart Cloud via Internet. Enables remote monitoring and control of connected products using the Wilo-Smart connect function in the Wilo Assistant app. Interfaces:
Power supply:
Infrastructure requirements:
Functions:
Scope of delivery:
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Pressure control (16) | |||
The differential pressure sensor kit enables dp-c and dp-v control of the frequency-controlled high-pressure centrifugal pumps. The sensor measures the differential pressure between the suction ports and discharge ports to the pipes, and converts this into an electrical signal 4-20 mA, which is used by the frequency converter to regulate the pressure of the pump. The value of the output current is proportional to the differential pressure. Scope of delivery
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The differential pressure sensor kit enables dp-c and dp-v control of the frequency-controlled high-pressure centrifugal pumps. The sensor measures the differential pressure between the suction ports and discharge ports to the pipes, and converts this into an electrical signal 4-20 mA, which is used by the frequency converter to regulate the pressure of the pump. The value of the output current is proportional to the differential pressure. Scope of delivery
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Kit for a pressure-constant control (p-c) of Helix EXCEL, Helix VE, MHIE, MVIE and MVISE pumps, control signal 4 – 20 mA. Scope of delivery
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Pressure sensor kit, 10 BAR | 4048064 | ||
Kit for a pressure-constant control (p-c) of Helix EXCEL, Helix VE, MHIE, MVIE and MVISE pumps, control signal 4 – 20 mA. Scope of delivery
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Pressure sensor kit, 16 BAR | 4048065 | ||
Kit for a pressure-constant control (p-c) of Helix EXCEL, Helix VE, MHIE, MVIE and MVISE pumps, control signal 4 – 20 mA. Scope of delivery
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Kit for a pressure-constant control (p-c) of Helix EXCEL, Helix VE, MHIE, MVIE and MVISE pumps, control signal 4 – 20 mA. Scope of delivery
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Signal transmitter for differential pressure-sensitive infinitely variable speed control. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
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Pressure sensor, 0 - 10 bar | 2550661 | ||
Signal transmitter for differential pressure-sensitive infinitely variable speed control. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
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Pressure sensor, 0 - 16 bar | 2550662 | ||
Signal transmitter for differential pressure-sensitive infinitely variable speed control. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
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Pressure sensor, 0 - 25 bar | 2550663 | ||
Signal transmitter for differential pressure-sensitive infinitely variable speed control. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
| |||
Signal transmitter for differential pressure-sensitive infinitely variable speed control. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
| |||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
| |||
Signal transmitter kit, 0 up to 10 bar | 2516556 | ||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
| |||
Signal transmitter kit, 0 up to 16 bar | 2516557 | ||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
| |||
Signal transmitter kit, 0 up to 25 bar | 2516558 | ||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
| |||
For mounting an automatic pump system with pressure-dependent operation. The pressure measured by the pressure sensor can be evaluated by the ER-2. Note Take care to ensure that a non-return valve is placed between pump and sensor. Further maintenance valves and a diaphragm pressure vessel are required for error-free functioning. Scope of delivery
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Level control (9) | |||
As a signal transmitter for the system switching, depending on the level of an open container or a cistern. Switching points: up ON / down OFF | |||
Float switch WA65 with 10 m cable | 503211893 | ||
As a signal transmitter for the system switching, depending on the level of an open container or a cistern. Switching points: up ON / down OFF | |||
Float switch WA65 with 20 m cable | 2004431 | ||
As a signal transmitter for the system switching, depending on the level of an open container or a cistern. Switching points: up ON / down OFF | |||
Float switch WA65 with 30 m cable | 2004432 | ||
As a signal transmitter for the system switching, depending on the level of an open container or a cistern. Switching points: up ON / down OFF | |||
Float switch WA KR1 S with 5 m cable | 6082806 | ||
As a signal transmitter for the system switching, depending on the level of an open container or a cistern. Switching points: up ON / down OFF | |||
Float switch WA KR1 S with 10 m cable | 6082807 | ||
As a signal transmitter for the system switching, depending on the level of an open container or a cistern. Switching points: up ON / down OFF | |||
Float switch WA65 (PSN-X) with 20 m cable | 6088843 | ||
As a signal transmitter for the system switching, depending on the fill level of an open tank or a cistern. Switching points: up ON/down OFF with switching contacts NO/COM/NC | |||
Float switch WA65 (PSN-X) with 10 m cable | 6088844 | ||
As a signal transmitter for the system switching, depending on the fill level of an open tank or a cistern. Switching points: up ON/down OFF with switching contacts NO/COM/NC | |||
As a signal transmitter for the system switching, depending on the fill level of an open tank or a cistern. Switching points: up ON/down OFF with switching contacts NO/COM/NC | |||
With Wilo as your partner, you can not only be sure of choosing high-quality product solutions, but also of benefiting from a comprehensive, worry-free package of well thought-out services. We collaborate to develop a service concept tailored to your individual needs; with our expertise and personal consultancy, we make sure that the operation of your systems is as energy-efficient, reliable and economical as possible. All the while our competent Wilo service technicians are ready to assist you with fast, reliable and on-time support.
Recommended services | |||
 Commissioning | Commissioning Booster Set 1-2 pumps | 2216414 | |
For perfect functioning of the pump(s) / system(s), it is recommended to have the commissioning carried out by the works' own WILO SE Customer Service Department. Optimum setting and efficient operation of the system are ensured as a result. Commissioning is comprised of the following points:
The price for commissioning only applies to system(s) which have been installed in accordance with the installation and operating instructions and state-of-the-art technology. No costs for any materials which may be required are included. -NET- | |||
 Maintenance | Maintenance BASIC Booster Set 1-2 pumps | 2160453 | |
In order to ensure and guarantee operational reliability of the pumps/systems, it is recommended to have regular and DIN-compliant inspections, maintenance and repair carried out by WILO SE’s own customer service. The tasks are carried out in accordance with DIN 31051 / DIN EN 13306. The tasks comprise the following points:
WILO SE schedules and organises initial maintenance and repairs. Further customised maintenance and repair services are possible after the first maintenance and repairs are conducted. | |||
Maintenance COMFORT Booster Set 1-2 pumps | 2160468 | ||
In order to ensure and guarantee operational reliability of the pumps/systems, it is recommended to have regular and DIN-compliant inspections, maintenance and repair carried out by WILO SE’s own customer service. The tasks are carried out in accordance with DIN 31051 / DIN EN 13306. The tasks comprise the following points:
WILO SE schedules and organises initial maintenance and repairs. Further customised maintenance and repair services are possible after the first maintenance and repairs are conducted. The quoted price refers to the initial maintenance and repair offered. -NET- | |||
Maintenance PREMIUM Booster Set 1-2 pumps | 2160483 | ||
In order to ensure and guarantee operational reliability of the pumps/systems, it is recommended to have regular and DIN-compliant inspections and maintenance carried out by the works' own WILO SE Customer Service Department. The tasks are carried out in accordance with DIN 31051 / DIN EN 13306. The tasks comprise the following points:
Scheduling and organisation are performed by WILO SE. Other individual maintenance offers are possible on request. | |||
More suitable services | |||
 Service packages | Service Package L Booster Set 1-2 pumps | 2216420 | |
The Wilo service offers predefined service packages in three sizes to make it easier to combine individual services. The Wilo-Service package L includes:
Optional add-on services:
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Service Package M Booster Set 1-2 pumps | 2216419 | ||
The Wilo service offers predefined service packages in three sizes to make it easier to combine individual services. The Wilo-Service package M includes:
Optional add-on services:
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Service Package S Booster Set 1-2 pumps | 2216418 | ||
The Wilo service offers predefined service packages in three sizes to make it easier to combine individual services. The Wilo-Service package S includes:
Optional add-on services:
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 Wilo-Live Assistant | Wilo-Live Assistant Service | 2216415 | |
The Wilo-Live Assistant is a technical advisor at your side during pump service. By using the Wilo-Live Assistant, our expert advisers can support you in the boiler or equipment room via video transmission – live and in real time. You use your smartphone to show the installation set-up, while the Wilo expert follows everything on their screen. They can see the components as well as other details and can thus determine where the fault or breakdown originates. We prevent downtime and ensure operational reliability of your pumps and systems! The Wilo-Live Assistant includes:
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 Extended Warranty | Extended Warranty Booster Set 1-2 pumps | 2216416 | |
In combination of a new pump or system Wilo offers an extended warranty of up to five years in combination with commissioning and maintenance by the Wilo Service. Extended warranty includes:
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 Supervision | Supervision Booster Set 1-2 pumps | 2216412 | |
Wilo supports during the concept phase to ensure quality work and cost efficiency. Our competent and qualified Wilo Service will support you with recommendations and technical advice throughout the entire project. Supervision includes:
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 Installation | Installation Booster Set 1-2 pumps | 2216413 | |
The Wilo service offers installation of our pumps or pumping systems. We offer an end-to-end process from gathering information on site to installing our product in the overall plant. An optimal installation set-up and the interaction of various individual factors lay the foundation for long-term operational safety. Installation includes:
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 System Optimisation | System Optimisation Booster Set 1-2 pump | 2216410 | |
The Wilo Service offers proactive system optimisation by optimising settings and doing minor adjustments to ensure operational reliability. System Optimisation includes among others:
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 Energy Solutions | Energy Solutions Booster Set 1-2 pumps | 2216411 | |
Wilo Service offers a proactive support to point out possible energy savings. Our service creates an overview of all installed assets to show how the energy consumption of pumps or systems can be reduced. We offer targeted consultancy and analysis, including the involvement of subsidies as well as comprehensive support around the changeover to high-efficiency technologies. Wilo-Energy solution includes:
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 Repair | Repair Booster Set 1-2 pumps | 2216417 | |
Wilo Service draws on their competence and experience while consulting on site to decide whether the pump can actually be repaired on site or has to be sent in for a factory repair. Wilo also provides spare parts or a replacement pump to restore the operational reliability of the system. Repair includes:
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