The Reliance RWC 22mm 2 Piece Multibloc is a storage tank water heater designed for homes and buildings. It features a brass tank lining material, making it durable and resistant to corrosion. The heating system for this product is a boiler, providing efficient and reliable hot water supply. This multibloc system offers a convenient solution for heating and hot water needs, with the added benefit of being manufactured by the trusted brand Reliance