| 摘要 |
The heating unit has a burner (1) in the combustion zone, with a cooling tube (2) at the upper surface of the burner, linked to a water inflow and a water outflow. The burner is mounted (8) in the combustion zone at least at one wall. The cooling tube is held at least at one wall of the combustion zone by separate mountings (6,11). The cooling tube is also held by a supporting plate, clipped on to the burner.
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