Pump group Afriso DK DN25 with direct heating circuit and Grundfos UPM3 HYBRID 25-70 pump (DWZ)

Pump group Afriso DK DN25 with direct heating circuit and Grundfos UPM3 HYBRID 25-70 pump (DWZ) is a preassembled hydraulic unit for integration into central heating systems. The unit is built around a DN25 flanged/connection size and includes a direct heating circuit and a high-efficiency Grundfos UPM3 HYBRID 25-70 circulation pump. It is intended to circulate heated water in residential and light-commercial installations and to simplify system balancing, flow control and maintenance operations.

Advantages

This pump group combines compact construction with factory-mounted components to reduce installation time and ensure consistent hydraulic performance. The integrated Grundfos UPM3 HYBRID 25-70 pump offers electronic speed control for energy-efficient circulation and improved temperature stability. The DN25 connections and direct heating circuit provide compatibility with common piping practices and permit straightforward integration into existing systems, while built-in valves and service access points facilitate routine inspection and servicing.

Suitable for

• Domestic central heating circuits in single-family houses and apartments
• Small commercial heating installations and light-commercial buildings
• Replacement or upgrade of existing DN25 circulation modules
• Systems requiring a direct heating circuit with controlled circulation

Key specifications

• Connection size: DN25
• Integrated circulation pump: Grundfos UPM3 HYBRID 25-70 with electronic speed control
• Designed function: direct heating circuit with hydraulic management and flow control
• Application: hot water circulation for heating systems in residential and light-commercial settings
• Service features: built-in shut-off and service access for maintenance

How to use

Install the pump group into the heating system at the designated return or supply manifold location using DN25-compatible pipework and fittings. Connect electrical supply to the Grundfos UPM3 HYBRID pump following the pump manufacturer’s wiring guidelines and ensure proper grounding. Commission the unit by purging air from the circuit, setting required flow and control parameters on the pump controller and checking for leaks. Adjust hydraulic balancing valves as needed to achieve target temperatures and flow rates. Follow local codes and the system designer’s instructions for safe and compliant installation.

Usage recommendations

Use corrosion-inhibited water and maintain recommended water quality and pH levels for longer equipment life. Schedule periodic inspections of connections, valves and the pump; verify electrical connections and controller settings at commissioning and after any maintenance. For optimal energy efficiency, configure the pump control to match the heating system’s load profile and consult the pump’s technical documentation for recommended operating ranges.