Circulation pump Omnigena CALDA 25-40/180 Auto, central heating pump, set includes 2 union fittings

Omnigena CALDA 25-40/180 Auto is a circulation pump for central heating systems engineered to maintain continuous coolant circulation in domestic and small commercial boiler loops. The model designation 25-40/180 reflects the pump's 25 mm nominal connection size, a maximum head characteristic of 4.0 m (40) and a 180 mm installation length/spacing. The set includes two union fittings to simplify installation and connection to existing pipework. The pump is intended for automatic operation within closed heating circuits and is compatible with radiators, underfloor heating recirculation and other standard hydronic systems.

Advantages

The Omnigena CALDA 25-40/180 Auto offers a compact design with standardized 25 mm connections and integrated features that support reliable, silent circulation. Supplied union fittings reduce installation time and the 180 mm length matches common pump spacings for direct replacement in many systems. The automatic operation mode ensures the pump adapts to system demands, helping to maintain stable flow rates without manual adjustments.

Suitable for

• Domestic central heating circuits and boiler loops
• Radiator systems requiring forced circulation
• Underfloor heating recirculation in small to medium installations
• Replacement of existing 25 mm pumps with 180 mm spacing

Key specifications

• Nominal connection diameter: 25 mm
• Head characteristic: up to 4.0 m
• Installation length / spacing: 180 mm
• Operation mode: automatic regulation for typical heating systems
• Included accessories: two union fittings for pipe connection
• Application: closed central heating and recirculation systems

How to use

Install the Omnigena CALDA 25-40/180 Auto on the return or feed line according to the system layout, ensuring the 180 mm pump spacing matches the pipeline supports. Fit the supplied union fittings to the pipe ends and tighten to form a reliable seal; follow standard practices for thread sealant or gaskets as applicable. Connect electrical supply and control wiring in accordance with local regulations and the pump's wiring diagram. After installation, bleed air from the circuit and verify correct rotation and flow direction. Set the automatic mode if adjustable controls are present and monitor system pressures and temperatures during the initial run to confirm stable operation.

Usage recommendations

Use corrosion-resistant fluids and maintain water quality according to heating system guidelines. Regularly check connections, seals and the pump body for leaks and perform periodic maintenance including removal of debris and inspection of the impeller. When replacing an existing pump, confirm the 25 mm connection and 180 mm spacing to ensure compatibility with the Omnigena CALDA 25-40/180 Auto.