4" STM 4-21 - Submersible Pump
The IBO 4" STM 4-21 submersible pump is a multistage centrifugal device with a diameter of 100 mm, powered by single-phase 230 V electricity. The 230 V power supply makes it suitable for domestic installations without access to three-phase power. Increased resistance to sand and floating impellers ensure reliable operation even in water intakes with poorer water quality.
Who is it for?
- Owners of single-family homes – the 230 V power supply enables installation without a three-phase connection.
- Allotment holders and farm owners – constant, reliable extraction of raw water from their own deep well.
- Users of irrigation systems – the pump supplies sprinklers and drip lines, as well as drainage systems.
- Installers – the single-phase version expands selection options where only 230 V power is available.
Applications
The 4" STM 4-21 submersible pump is designed for extracting and pumping technically clean raw water from drilled deep wells and for increasing pressure in the system supplying an installation. It is used for extracting and pumping raw water in single- and multi-family homes, farms, heat pump systems, and for supplying irrigation and drainage systems.
The pump operates in a vertical position, submerged in a well with a minimum internal diameter of 115 mm. The pumped water must not contain mechanical impurities other than the permitted sand content, and its temperature should not exceed 35°C. The 4" STM 4-21 230V submersible pump is a durable solution for long-term use in households. The pump is not a water-treatment device – when using it for other purposes, we recommend ensuring appropriate water preparation.
Features of the 4" STM 4-21 pump
The 4" STM 4-21 is a multistage centrifugal device with a diameter of 100 mm, powered by single-phase 230 V electricity. The use of floating impellers and increased resistance to sand enables reliable operation in water intakes where standard submersible pumps would experience accelerated wear. The permitted sand content is up to 5%, and the motor is oil-cooled.
Thermal protection built into the motor winding protects the device from overheating. The suction and discharge bodies are made of brass; the housing, shaft, and rotor are made of AISI 304 stainless steel; and the impellers and diffusers are made of PPO polymer. The mechanical seal operates in a SiC/SiC/NBR configuration. The pump is supplied as standard with a 2 m power cable.
- Type: multistage centrifugal submersible pump
- Pump diameter: 100 mm
- Minimum well diameter: 115 mm
- Power supply: 1~ 230 V / 50 Hz
- Protection rating / insulation class: IP68 / class B
- Operating mode: continuous
- Max. liquid temperature: 35°C
- Max. immersion depth: 150 m
- Power cable: 2 m
- Materials: brass, AISI 304 stainless steel, PPO polymer
IBO – 24-month (2-year) manufacturer's warranty. Warranty service and post-warranty service are provided by Dambat.
Dambat – a trusted manufacturer of pumps and water-engineering equipment with quality certificates.
Frequently Asked Questions (FAQ) – 4" STM 4-21 submersible pump
What is the 4" STM 4-21 submersible pump used for?
The IBO 4" STM 4-21 pump is used for extracting and pumping raw water from drilled deep wells and for increasing pressure in the system supplying an installation. Thanks to its 230 V power supply, it is suitable for homes without a three-phase connection.
How does the 4" STM differ from the 4" ST?
4" STM pumps are powered by single-phase 230 V electricity, while 4" ST pumps are powered by three-phase 400 V electricity. The hydraulics of both versions are the same, and the choice depends on the type of power supply available in the installation.
Can the 4" STM 4-21 pump be connected to a standard 230 V socket?
The pump is powered by single-phase 230 V electricity; however, the electrical installation should be carried out by a suitably qualified person. The circuit must be equipped with a residual-current device and proper grounding.
What type of well can the 4" STM 4-21 pump be installed in?
The pump can be installed in a well with a minimum internal diameter of 115 mm, in a vertical position. The maximum immersion depth is 150 m, and the discharge connection should be located at least 2 m above the lowest water-level point.
Can the 4" STM 4-21 pump handle sandy water?
The pump has increased resistance to sand thanks to its floating impellers and permits a sand content of up to 5%. However, keep in mind that pumping water containing sand still shortens the service life of the working components.
Where can the 4" STM 4-21 submersible pump be purchased?
As the manufacturer, we do not sell directly. The IBO 4" STM 4-21 submersible pump can be purchased from our trade partners, installation wholesalers, and authorized online distributors.
What warranty does the 4" STM 4-21 pump come with?
The IBO 4" STM 4-21 submersible pump comes with a 24-month (2-year) manufacturer's warranty. Warranty service and post-warranty service are provided by Dambat.
