Why Plastic Aluminium Pipes (Pexal) with Underfloor Heating

Pexal Pipes are made by uniting the positive characteristics of polyethylene crosslinked with silanes and with those of aluminium. Pexal Pipes are characterised by a particular multi-layer structure which distinguishes itself from other pipes used in UFH systems in that it possesses an internal layer of aluminium which is wrapped around the pipe and renders it 100% oxygen proof. The multi-layer pipe offers all the typical advantages of a metal pipe as those of a plastic pipe and at the same time, the qualities of one material compensate for the inadequancies of the other. The negative aspects of the metal, such as corrosion, toxicity, incrustations, rigidity, weight and elevated pressure loss are neutralised by the crosslinked polythene, which is in contact with the fluid transported inside the pipe. The negative aspects of the plastic, such as elevated heat expansion and dimensional instability, the fact that it is permeable to gas and sensitive to UV rays, are all overcome thank to the layer of aluminium

The outstanding features and versatility of these pipes make them ideal for underfloor heating systems, in terms of installation (unlike all-plastic piping they keep their shape) and heat yield (heat conductivity from 0.42 to 0.47 W/mK in relation to diameter, compared to 0.38 W/mK for all-plastic piping). This translates as energy saving and being able to use lower diameters (Pexal measures 16x2 compared to all-plastic piping measuring 17x2).
Pexal multi-layer pipe is a quality product with exceptional features for this application and its special thermo-mechanical properties place it between copper pipes (high conductivity and good mechanical strength) and all-plastic pipes (lower conductivity and lower mechanical strength).
One of the requirements plumbers mention most is flexibility. PEXAL pipes are obviously not as flexible as all-plastic pipes but their ductility means they keep their shape when coiled on the panel or inside the indentations of contoured panels.Also when using pipe tracking, pexal is much easier lay accurately due to the stiffness of the pipe.This is ideal with underfloor heating.
How often have you fitted a section of all-plastic pipe only for the other end to come out from the indentations because the pipes are so flexible?In this case fixed coils with a lot of clips are used.A floor heating panel must provide thermal yield, and PEXAL pipes are certainly the best product for this on the market today.

Heating Solutions Ltd Solar Panels – Underfloor Heating – Heat Pumps
29 Suil na Habhann, Mill Rd, Limerick, IrelandTel: 086 3823062; Fax: 061 346011Email: info@heating-solutions-ireland.com
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