The pipe
Valsir’s floor heating system has been designed to use PEXAL and MIXAL pipes - which readers certainly need no introduction to. The outstanding features and versatility of these pipes make them ideal for these types of 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 (MIXAL measures 16x2 compared to all-plastic piping measuring 17x2).
Valsir’s 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 fitters mention most is flexibility. PEXAL and MIXAL 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.
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 and MIXAL pipes are certainly the best product for this on the market today.
