Boiler module HEAT BLOC K31 - non-mixed - DN 40; without pump PAW.K31-DN 40

Product detailed description

The HEAT BLOC K31 DN 40 is commonly used in residential and commercial buildings with central heating systems that require a non-mixed boiler configuration. It integrates directly into the circulation circuit and is typically installed alongside boilers or within modular heating systems. Installers working with larger systems benefit from its robust design and pre-assembled components such as ball valves, thermometers and check valves. The module supports direct connection to the heating network or via a distribution unit.

When installing, the module is positioned between the boiler and the heating system, ensuring stable flow conditions and thermal separation where required. It is suitable for both single and multi-loop configurations, making it adaptable to a variety of building layouts and system architectures. Its compact form factor allows for space-efficient installation in mechanical rooms or utility areas.

Technical parameters

Installation and connection

The module includes inlet and return piping, a circulation pump, two thermometers, two ball valves, a check valve and thermal insulation. Connection is made using DN 40 ports, which require matching fittings and pipe diameters. Before final tightening, ensure all connections are free of debris and aligned correctly to prevent leakage or misalignment during operation. A common mistake is incorrect orientation of the check valve, which can lead to backflow issues. Always verify the direction of flow indicated on the module body.

Compatibility and accessories

This boiler module is designed for standalone operation or connection via a distribution unit PAW.MV40. When using a distribution unit, ensure compatibility of port dimensions and sealing types. Additional components such as control panels, balancing valves or expansion tanks should be sourced separately depending on the system’s complexity and regulatory requirements. No alternative or related products are specified for this model.

Technical background for designers

Constructed primarily from brass, the module offers corrosion resistance and durability under normal operating conditions. The thermal insulation made of EPP minimises heat loss and reduces energy consumption. The module operates as part of the primary circuit, providing a stable interface between the boiler and the secondary heating loop. Efficiency is influenced by the correct selection of pump capacity and proper hydraulic balancing of the system. Long-term performance depends on regular inspection of seals and valves to prevent leaks and maintain pressure integrity.

Service and operation

During routine inspections, check the condition of the ball valves and thermometers for signs of wear or blockage. The circulation pump should be monitored for unusual noise or vibration, which could indicate bearing or seal failure. The thermal insulation should be inspected for damage that might expose the brass components to condensation or environmental stress. No specific service intervals are provided in the technical documentation.

Frequently asked questions

Can the HEAT BLOC K31 DN 40 be used in mixed heating systems?
No, this model is specifically designed for non-mixed applications and cannot be adapted for mixed systems due to its internal configuration.

Is it possible to connect the module directly to a boiler without a distribution unit?
Yes, the module can be connected directly to the boiler or via a PAW.MV40 distributor depending on the system layout.

What materials are used for the internal components of the module?
The internal piping and housing are made from brass, which provides good resistance to corrosion and thermal stress.

How does the thermal insulation affect system efficiency?
The EPP insulation reduces heat loss and improves overall efficiency by minimising energy waste along the piping.