Storacell Eco KWS is a combined freshwater stratified cylinder that generates hot water with instantaneous heating. The solar sys-tem or the solid fuel boiler stratify the hot water in the cylinder. In the cylinder, there is a big stainless steel corrugated tube for the domestic water. While it runs through the pipe, it is heated by the heating water. The 1000-litre cylinder has a capacity of up to 23.2 litres per minute (at 70 °C flow pipe and 45 °C hot water tempera-ture). Storacell Eco KWS is also available in two smaller versions with a 500-litre and 800-litre cylinder.