A DOMESTIC WATER AND SPACE HEATING SYSTEM

摘要

A system comprising a central heating circuit (2) and a hot water supply circuit (4). The central heating circuit comprises a boiler (1) and at least one space heater (2). The hot water supply system comprises a tank (3) with a cold water supply (31) and a hot water outlet (39) to supply domestic hot water. A secondary heat source (5) with a secondary heating coil (53) is in thermal contact with a bottom portion of the tank. The central heating circuit passes through a coil system (24, 27) in thermal contact with the tank. In a water heating mode, hot liquid from the boiler (1) is circulated through the coil system (24, 27) to heat the water in the tank. In a central heating heat recovery mode, liquid is circulated from a return line of the central heating circuit through the coil system (24, 27) to extract heat from the tank for the central heating circuit. The coil system comprises a primary heating coil (27) for the water heating mode and a heat recovery coil (24) below the primary heating coil (27) for the central heating heat recovery mode.