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Dual wall cylinder

Dual wall cylinders have what can be described as a "cylinder in cylinder" design, where the DHW in the inner cylinder is heated by the surrounding heating water in the outer one. The exchange of heat takes place across the entire surface area of the inner cylinder wall. Thanks to its large heat transfer surface, a dual wall cylinder enables a high DHW output with a low heat-up time, despite low heating water flow temperatures. As a result, even the environmental energy obtained by a heat pump system can be used for the hot water supply, for example.