2.5" STM 31 – submersible pump with a 20 m cable
The IBO 2.5" STM submersible pump is a multistage design with increased resistance to sand, 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-fitted 20 m cable eliminates the need for additional cable extensions at typical installation depths.
Who is it for?
-
Owners of single-family homes – the small 66 mm diameter allows the pump to be installed in very narrow wells.
-
Allotment holders and gardeners – the compact design is suitable for powering irrigation and watering systems on smaller plots.
-
Farms with lower water requirements – floating impellers and increased resistance to sand ensure reliable operation in more difficult 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 is compatible with standard hydrophore tanks and pressure control systems.
Features of the 2.5" STM series
The 2.5" STM series pumps have a suction and discharge body made of brass, and a casing, shaft, and rotor made of AISI 304 stainless steel, while the impeller and diffuser are made of PPO polymer. Increased resistance to sand and floating impellers ensure reliable operation even in more difficult intake conditions.
The capacitor built into the motor eliminates the need for an external starting box, while thermal protection built into the winding protects the motor against overload.
- Pump type: multistage, submersible, with increased resistance to sand
- Diameter: 66 mm (2.5")
- Minimum well diameter: 75 mm
- Power supply: 230 V (single-phase)
- Capacitor: built into the motor – no external starting box required
- Power cable length: 20 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, casing/shaft/rotor – AISI 304 stainless steel, impeller and diffuser – PPO polymer, mechanical seal – SiC/SiC/NBR
IBO – 24-month (2-year) manufacturer’s warranty. Warranty and post-warranty service is provided by Dambat.
Dambat – a trusted manufacturer of pumps and water engineering equipment with quality certificates.
Frequently asked questions (FAQ) – 2.5" STM submersible pump
What 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 advisable to measure the actual well diameter.
Does the 2.5" STM pump require an external starting box?
No. The capacitor is built into the motor, so the pump does not require an external starting box, simplifying installation.
What is the difference between the 2.5" STM and the 3" STM?
Both series have a similar material design: brass suction and discharge bodies, a casing, shaft, and rotor made of AISI 304 stainless steel, and impellers and diffusers made of PPO polymer. They mainly differ in dimensions and capacity: 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, for wells from 85 mm) achieves 100 l/min. The choice mainly depends on the available well diameter and the required amount of water.
How do I choose a 2.5" STM pump model for my needs?
The choice depends on the well depth and water requirements – both models have the same capacity 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 invite 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 trade partners, installation wholesalers, and authorised online distributors.
What warranty conditions apply to the 2.5" STM pump?
IBO – 24-month (2-year) manufacturer’s warranty. Warranty and post-warranty service is provided by Dambat.
