| 摘要 |
A water storage vessel 8 is heated by a burner 1 communicating with a flame tube 3 extending through the vessel 8 which is provided with a pipe coil 7 in its interior for heating water for room-heating 46 and communicating with a heat exchanger 6, accommodated in the interior of the flame tube 3. The water storage vessel 8 is provided with both heat insulation 20 adjacent to the flame tube 3 and 21 on its outside surfaces. A second water condensing coil 30 may be in series with the coil 6 but in the flue 22 which includes a fan 23 and a split funnel 32/35 for collecting condensate, an S-bend preventing condensate from falling into the tube 6. To minimise the emission of pollutants, the burner may be supplied by a mixing chamber (26), which is connected to gas and air supply lines (27, 25), which may contain independent throttle valves (28, 29), controlled by a common control device (18) (Fig 1, not shown). <IMAGE> |
