Boiler module HEAT BLOC K32 - 3-way mixing valve - DN 32; Grundfos ALPHA2.1 L 32-60 PAW.K32-DN 32

Product detailed description

The HEAT BLOC K32 boiler module is designed for installation in residential and commercial heating systems requiring precise temperature control and efficient flow distribution. This unit is commonly integrated into radiators, underfloor heating circuits, or buffer tanks. Installers typically work with existing boiler systems or retrofit older setups to improve energy efficiency. The DN 32 nominal size ensures compatibility with standard pipe diameters in central heating applications.

The module operates by directing hot return water through a three-way mixing valve to maintain safe temperatures in the boiler circuit. The Grundfos ALPHA2.1 L 32-60 pump provides variable speed operation for accurate flow regulation. The thermal insulation reduces heat loss, while the built-in service motor allows remote actuation of the valve via a 230 V power supply. The system is sized for installations with a maximum differential temperature of 20 K and a total output of 51 kW.

Technical parameters

Installation and connection

Installers should begin by verifying the alignment of DN 32 pipe connections to the boiler and return lines. The module can be connected directly to the system or via a separate distributor. All threaded fittings require sealing compound or PTFE tape to prevent leaks. Ensure proper orientation of the three-way valve and secure mounting of the Grundfos pump using the provided fixing brackets.

Check the integrity of all ball valves and shut-off mechanisms before commissioning. Confirm the correct positioning of the thermostatic actuators and verify the electrical connection to the 230 V supply. Common installation errors include incorrect valve direction, misaligned pipe connections, and failure to isolate the system during commissioning. Always test the system for air pockets after filling.

Compatibility and accessories

This module is compatible with central heating systems using glycol or water as the heat transfer medium. For larger installations, additional modules may be required to distribute load evenly across multiple circuits. No specific accessories are included beyond those in the standard configuration. Related products should be selected based on the system’s overall design and flow requirements.

Technical background for designers

The three-way mixing valve regulates the ratio of return and supply water to maintain consistent temperatures within the boiler. Brass construction offers corrosion resistance and long-term durability in wet environments. The EPP insulation minimises condensation and reduces heat loss along the piping. System performance depends on accurate sizing of the pump and valve to match the building’s thermal demand. Designers should account for pressure drops and flow resistance when integrating this module into complex heating networks.

Service and operation

Periodic inspection of the Grundfos pump for blockages and wear is recommended. Check the operation of the three-way valve and ensure the servomotor responds correctly to temperature signals. Verify that all ball valves and shut-off devices function smoothly. There are no specified service intervals in the provided data, but routine checks are advised for optimal system performance.

Frequently asked questions

Can the Grundfos ALPHA2.1 L 32-60 pump be replaced with another model?
No, the pump is specifically rated for the flow and pressure requirements of this module and cannot be substituted without affecting performance.

Is the three-way mixing valve adjustable manually?
Yes, the valve can be manually adjusted for testing or emergency overrides, but normal operation relies on the automatic servomotor.

Can this module be used in a system with multiple boilers?
Yes, provided that the system is balanced and each boiler is paired with an individual module for independent flow control.

What is the maximum allowable temperature in the boiler circuit?
The maximum operating temperature of the module is +110 °C as specified in the technical documentation.