Øs Varme ØS Alu-18 is an aluminium underfloor heating mat with 18 W/m linear output, totalling 220 W over 12 m at 230 V. The aluminium substrate distributes heat evenly beneath laminate and wooden floors while permitting a low build-up height. It is intended as comfort heating in dry indoor floor constructions where cast-in cable is not practical. Installation follows the manufacturer's fixed-power layout without cutting the heating element.