| 摘要 |
The system comprises 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. 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 is circulated through the coil system to heat the water in the tank. In a central heating heat recovery mode, liquid is circulated from a return line of the circuit through the coil system to extract heat from the tank for the circuit. Preferably a primary coil is located above a recovery coil. |
