The Gledhill StainlessLite Plus HP Duo 300L Pre-Plumbed Heat Pump Cylinder with Buffer is a hot water storage cylinder designed for use with heat pump systems. Here are some key features: Capacity: The "300L" indicates it has a storage capacity of 300 liters, making it suitable for larger households or commercial applications. Stainless Steel Construction: The cylinder is made from stainless steel, which offers durability and resistance to corrosion. Pre-Plumbed: This means the cylinder comes with pre-installed plumbing components, making installation quicker and easier. Buffer Tank: The inclusion of a 70L internal buffer tank helps manage fluctuations in temperature and demand, improving efficiency and performance of the heat pump system. Compatibility: It's designed to work effectively with heat pump systems, providing a reliable source of hot water. Overall, this unit is aimed at enhancing the efficiency of heating systems, particularly in eco-friendly applications. Gledhill StainlessLite Plus HP Duo 300L Pre-Plumbed Heat Pump Cylinder c/w Buffer