| 摘要 |
<p>The invention relates to a central heating boiler, comprising a furnace (11) surrounded by a water chamber (10) for passing a heating-water circulation (14, 15) therethrough. The rear section of furnace (11) is provided with a rather flat heat-exchanger tank (3) for heating the service water. A thermostat (5) measuring the temperature of service water controls an oil or gas burner also when a second thermostat (9) measuring the temperature of boiler water is switched off of preparation.</p> |
