| 摘要 |
The heater 10 comprises a heat source and a first heat exchanger arranged to heat a working fluid such as water passing through a housing (12, figure 3) of the heater. Ideally, a gas-fired condensing boiler 60 provides the heat source and first heat exchanger. A water-to-air heat exchanger 78 uses the heated water to heat a source of air. The heat source, first heat exchanger and water-to-air heat exchanger are mounted within the housing to provide a compact heater. The boiler is located above the water-to-air heat exchanger. Preferably the source of air is received via an air inlet 24 in a roof of the heater, and is drawn by a fan 76 along an air duct 56, through an air filter (40, figure 3), through an air guide 80 and into a box 82 of the water-to-air heat exchanger before exiting the heater via one or more air outlets, which can be connected to air ducts. The boiler may be mounted on an outer wall 72 of the duct by brackets 74 to reduce operational noise of the heater. Water may be passed through the housing via inflow 26 and outflow 28 pipes. Another heater is also claimed. |
