| 摘要 |
The present invention refers to a heating apparatus for warm/hot water preparation for heating and sanitary purposes, in particular to a condensing heating apparatus. Said heating apparatus comprises a combustion chamber (1) and a vertically orientated section (2) for heat exchange between flue gases and heating fluid, said section (2) is associated with a chamber (1) at the bottom end thereof. Here, said section (2) is formed by a number of concentric and mutually radially spaced double walls (16, 17, 18), thus forming ring-shaped flue gas channels (19, 20) between each neighbouring double walls (16, 17; 17, 18). Each double wall (16, 17, 18) is formed on the side facing each other with bulges (29) extending over the entire circumference of each double wall (16, 17, 18), whereas in the space between each double walls (16, 17, 18) there is arranged a partition wall (28) extending in a helix-like manner.
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