The Reliance RWC 22mm 2 Piece Multibloc is a storage tank water heater with a brass tank lining material. This 3.5 bar and 8 bar heating system is designed for use with boilers, providing efficient and reliable hot water heating for your home. The 2 piece design makes installation and maintenance easier, ensuring a smooth and hassle-free experience. With the Reliance brand known for quality and durability, this water heater is a smart investment for any heating system.