2.5" STM 31 – submersible pump
The IBO 2.5" STM submersible pump is a multistage design with enhanced sand resistance, intended to supply water to single- and multi-family homes, farms, and irrigation systems. Its small diameter allows installation in narrow boreholes, while the factory-installed 20 m cable eliminates the need for additional cable extensions at typical installation depths.
Who is it for?
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Single-family homeowners – the small 66 mm diameter allows the pump to be installed in very narrow wells.
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Allotment holders and gardeners – the compact design works well for supplying irrigation and watering systems on smaller plots.
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Farms with lower water demand – floating impellers and enhanced sand resistance ensure reliable operation in more challenging water intakes.
Applications
The 2.5" STM series is designed for drawing clean raw water from narrow, drilled deep-water intakes for single- and multi-family homes, farms, irrigation systems, and drainage systems.
The pumps operate in a vertical position, in wells with a minimum internal diameter of 75 mm, at a maximum pumped-water temperature of 35°C. The 2.5" STM 230 V submersible pump works with standard pressure tanks and pressure-control systems.
Features of the 2.5" STM series
The 2.5" STM series pumps feature a brass suction and discharge body, a housing, shaft, and rotor made of AISI 304 stainless steel, and an impeller and diffuser made of PPO polymer. Enhanced sand resistance and floating impellers ensure reliable operation even in more challenging intake conditions.
The capacitor built into the motor eliminates the need for an external start box, while the thermal protection built into the winding protects the motor against overload.
- Pump type: multistage, submersible, with enhanced sand resistance
- Diameter: 66 mm (2.5")
- Minimum well diameter: 75 mm
- Power supply: 230 V (single-phase)
- Capacitor: built into the motor – no external start box required
- Power cable length: 2 m
- Protection rating: IP68
- Insulation class: B
- Operating mode: continuous
- Operating position: vertical
- Maximum liquid temperature: 35°C
- Maximum immersion depth: 100 m
- Rotational speed: 2850 rpm
- Materials: suction and discharge body – brass, housing/shaft/rotor – AISI 304 stainless steel, impeller and diffuser – PPO polymer, mechanical seal – SiC/SiC/NBR
IBO – 24-month (2-year) manufacturer's warranty. Dambat provides warranty and post-warranty service.
Dambat – a trusted manufacturer of pumps and water-management equipment with quality certifications.
Frequently asked questions (FAQ) – 2.5" STM submersible pump
What type of well is the 2.5" STM submersible pump suitable for?
The pump is designed for wells with a minimum internal diameter of 75 mm, allowing it to be installed in very narrow boreholes inaccessible to most submersible pumps. Before purchasing, it is worth measuring the actual well diameter.
Does the 2.5" STM pump require an external start box?
No. The capacitor is built into the motor, so the pump does not require an external start box, simplifying installation.
What is the difference between the 2.5" STM and the 3" STM?
Both series have a similar material construction – brass suction and discharge bodies, a housing, shaft, and rotor made of AISI 304 stainless steel, and impellers and diffusers made of PPO polymer. They differ mainly in dimensions and output: the 2.5" STM has a diameter of 66 mm and fits wells from 75 mm, achieving 45 l/min, while the 3" STM (75 mm, wells from 85 mm) achieves 100 l/min. The choice depends mainly on the available well diameter and the required amount of water.
How do I choose the 2.5" STM pump model for my needs?
The model choice depends on the well depth and water demand – both models have the same output of 45 l/min and differ in delivery head (STM 24 up to 66 m, STM 31 up to 85 m). If in doubt, we encourage you to contact the technical department.
Where can I buy the 2.5" STM submersible pump?
Dambat does not sell directly. Pumps from the 2.5" STM series are available from commercial partners, plumbing wholesalers, and authorized online distributors.
What warranty conditions apply to the 2.5" STM pump?
IBO – 24-month (2-year) manufacturer's warranty. Dambat provides warranty and post-warranty service.
