The FlowCyl sets the standard for unvented cylinders, manufactured in the UK to the highest quality by manufacturing specialists. These cylinders are made of high quality duplex stainless steel, providing a 25-year warranty and supplied with market leading components to give you peace of mind for years to come. The FlowCyl provides fast flowing water to all outlets, even in high use situations it is designed to reheat quickly with its superior performance and low heat loss.