| 摘要 |
The present invention relates to a hot water storage cylinder comprising a single-piece plastic cylinder and one or more circumferential heating coils, the single-piece cylinder being formed without internal welds such that it is internally crevice-free. In one embodiment, the thickness of one or more parts of the cylinder body may be different to the thickness of one or more other parts of the cylinder body. In another embodiment, on or more of the heating coils is helically wound around a circumference of the cylinder body. In another embodiment, the cylinder body includes or more tracks in its outer surface to locate or help locate the or each heating coil around its circumference. <Figure 2>
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