The ALU brand comprises HE and Plus HE options, which are high power floor-standing aluminium condensing gas boilers with six different versions from 116 kW to 280 kW in the ALU HE option and three different versions from 360 kW to 1.1 MW in the ALU Plus HE option, packing a powerful punch and making the Sime range definitely worth a second look on larger, more demanding commercial projects.