PEX-AL-PEX 32 x 3 piping for heating, underfloor heating and water

Product detailed description

This PEX-AL-PEX composite pipe is commonly used in residential and commercial buildings for central heating, underfloor heating and domestic water supply systems. Installers typically handle this type of pipe in new construction, renovations or system upgrades. The pipe’s layered structure ensures resistance to oxygen diffusion and thermal expansion while maintaining flexibility for bending around obstacles. Its design supports long-term reliability in both low-temperature radiant heating and high-temperature water distribution applications.

When working with this pipe, installers must consider thermal expansion characteristics, bending radii and appropriate fittings. The pipe is suitable for concealed installations behind walls and floors, making it ideal for underfloor heating systems where space and insulation are critical factors. The smooth inner surface reduces friction losses and prevents scaling, which is essential for maintaining system efficiency over time.

Technical parameters

Installation and connection

Installation begins with planning the layout and measuring the required lengths. The minimum bending radius without tools is 5 times the outer diameter, and with a spring bender, it is 3 times. This allows for tight bends in confined spaces. The pipe should be cut cleanly with a pipe cutter to ensure a flat, burr-free end. Press or screw fittings are recommended for secure connections. When using screw fittings, ensure a proper seal with compatible gaskets or tapes. Always verify that the pipe is free from kinks and that the ends are clean before fitting installation.

Compatibility and accessories

This PEX-AL-PEX 32 x 3 pipe is compatible with standard screw fittings for secure and leak-free connections. It works well with underfloor heating manifolds and distribution systems. When ordering, ensure that the necessary fittings, valves and insulation materials are included. Related products such as the PEX-AL-PEX 20 x 2 pipe can be used for smaller diameter applications within the same system. Accessories such as pipe clips and insulation sleeves should also be considered for securing and protecting the pipe during and after installation.

Technical background for designers

The PEX-AL-PEX pipe combines cross-linked polyethylene (PEX) with an aluminium layer to create a composite structure that offers both flexibility and rigidity. This construction is particularly beneficial in closed-loop heating systems where oxygen ingress can lead to corrosion. The pipe integrates seamlessly into radiant heating systems and domestic water circuits, ensuring long-term performance and minimal maintenance. Designers should account for the pipe’s thermal expansion characteristics when planning expansion loops or compensators to prevent mechanical stress on the system.

Service and operation

During operation, the pipe requires no regular maintenance due to its non-corrosive and scale-resistant properties. However, it is important to periodically inspect the system for leaks, especially at joints and fittings. Ensure that the pressure and temperature remain within the specified limits of 10 bar and 70°C to avoid premature failure. If the system is exposed to higher temperatures or pressures, additional protective measures should be implemented. No scheduled service intervals are required for this pipe, but any signs of damage or wear should be addressed immediately to maintain system integrity.

Frequently asked questions

Can the PEX-AL-PEX 32 x 3 be used in underfloor heating systems?
Yes, the pipe is suitable for underfloor heating systems due to its flexibility and thermal conductivity. It can be bent to fit beneath floor slabs and is compatible with standard manifold systems.

What is the recommended method for connecting the pipe to fittings?
Screw fittings are recommended for connecting the PEX-AL-PEX 32 x 3 pipe. These provide a secure and reliable connection when properly sealed with compatible gaskets or tapes.

How does the pipe handle thermal expansion?
The pipe has a linear expansion coefficient of 0.026 mm/m.K, which must be accounted for in system design. Expansion loops or compensators should be included to manage this effect and prevent mechanical stress.

Is the PEX-AL-PEX 32 x 3 suitable for hot water supply?
Yes, the pipe is suitable for hot water supply with a maximum continuous temperature of 70°C and a short-term limit of 95°C. It maintains structural integrity and prevents oxygen diffusion in hot water systems.