| 摘要 |
An improved heat exchanger includes a central chamber, preferably in the form of a tube, having a proximal end and a distal end. A return manifold is connected to the distal end of the central chamber. A plurality of tubes, which are preferably straight, are positioned around the central chamber. In one embodiment, two or more circumferential patterns of tubes, each at a different radius, are equally spaced around the central chamber. An exhaust manifold receives the tubes and includes an exhaust vent.
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