IBO OHI 25/40-130

Product detailed description

This circulation pump is commonly used in residential and commercial heating systems, including underfloor heating and central heating circuits. It is suitable for systems where variable flow rates are required to match load conditions. The pump is typically installed in closed-loop systems where water temperature can vary between 2°C and 110°C. It is often found in boiler rooms, mechanical rooms, or near heat generators. The pump’s compact dimensions and standard mounting length make it compatible with most existing enclosures and pipe layouts.

When installed, the pump ensures even distribution of hot water or heating medium throughout the system. The three-speed setting allows for manual adjustment of flow and pressure, which is particularly useful in systems with varying demand. The pump is designed for use with water-based media and is not intended for chemical or oil-based fluids. The IP44 rating ensures protection against dust and splashing water, making it suitable for indoor environments with normal humidity levels.

Technical parameters

Packaging dimensions (mm)	140/170/130
Power supply	220-230V / 50Hz
Bearing material	glass ceramic
Maximum flow rate based on speed (1/2/3)	18L/min / 36L/min / 48L/min
Maximum pressure in the pipe	10 bar
Rated current	0.41 A
Mounting length	130 mm
Protection	IP44
Pipe	1" / DN25
Connection thread	1 1/2" (6/4") - 42 mm
Medium temperature	2-110 °C
Power based on speed (1/2/3)	38W / 53W / 72W
Discharge pressure	4 m
Weight	2.3 kg
Code	IBO OHI 25/40-130
Brand	AVANSA

The pump’s three speed settings provide flexibility in flow and power consumption. At first speed, it delivers 18 L/min with 38 W power, while at third speed, the flow increases to 48 L/min with 72 W. The maximum pressure of 10 bar and 4 m head make it suitable for systems with moderate hydraulic resistance. The 130 mm mounting length and 1-inch pipe size allow for standard installation in most heating systems.

Installation and connection

The pump should be installed on a horizontal pipe section to ensure proper operation and prevent air entrapment. The 1 1/2-inch connection thread (42 mm) requires a compatible pipe fitting with a DN25 internal diameter. Prior to installation, the system should be drained and cleaned to avoid debris entering the pump. The mounting length of 130 mm allows for standard bracket placement and alignment with the pipe. Common mistakes include incorrect thread orientation, failure to align the pump with the pipe axis, and neglecting to secure the mounting brackets properly. After installation, the pump should be tested at each speed setting to verify flow and pressure performance.

Compatibility and accessories

The pump is compatible with standard heating systems using water as the heat transfer medium. It can be used with thermostatic valves, expansion vessels, and pressure-reducing valves. For systems requiring electronic control, an external controller must be added separately. No additional accessories are required for basic installation, but a pressure gauge and flow meter may be recommended for monitoring system performance. The pump is not compatible with oil-based or chemical media due to the materials used in its construction.

Technical background for designers

The pump operates using a mechanical rotor speed switch that adjusts the motor speed based on the selected setting. The glass ceramic bearings reduce friction and noise, even at higher speeds. The cast iron body with anticorrosive enamel coating provides resistance to aggressive water environments, reducing the need for frequent maintenance. The pump is integrated into the system by connecting it to the main circulation loop, ensuring that the flow rate and pressure match the system’s design parameters. The service life and efficiency of the pump depend on the quality of the water, the absence of abrasive particles, and the correct installation of the pump in the system.

Service and operation

The pump requires no scheduled maintenance due to its durable materials and sealed design. However, regular checks should be performed to ensure the pump is operating at the correct speed and that there are no signs of vibration or noise. If the pump fails, the control unit can be separated from the body for inspection or replacement without removing the entire unit. The IP44 rating ensures that the pump is protected against dust and water ingress during normal operation. No specific service intervals are required, but the pump should be inspected during system maintenance or if performance issues arise.

Frequently asked questions

Can the pump be used with underfloor heating systems?
Yes, the pump is suitable for underfloor heating systems due to its low noise operation and variable flow settings, which allow for precise control of heat distribution.

Is the pump compatible with 1-inch piping?
Yes, the pump is designed for 1-inch pipe (DN25) and can be connected using the 1 1/2-inch thread (42 mm) provided on the pump body.

Can the pump be operated at temperatures above 110°C?
No, the maximum operating temperature of the medium is 110°C as specified in the technical parameters. Exceeding this limit may damage the internal components.

Can the pump be controlled with an external controller?
Yes, the pump has a mechanical speed switch, but it can also be connected to an external controller if variable speed control is required for automated systems.