Throughflow water heater for electric coffee maker - has spring sections of flow pipe maintaining flow elements in contact with heating element

摘要

The heater has at least two flow elements (1) each with at least one flow channel (1a), arranged in the flow line (2) on either side of an electric heating element (3). This is formed from a cold-conductive ceramic material with surface electrodes (4) each with an insulating coating (5). The expansion coefficient of the material of the flow line (2) is less than the expansion coefficient of the material of the flow elements (1), the peripheral shape of the flow line (2) providing a number of spring points resisting its widening out due to the expansion forces. Pref. the flow line (2) has an H shaped cross-section with the two flow elements (1) and the heating element (3) contained in the cross limb the remaining flanks (2b,2c) acting as springs, holding the flow elements (1) in contact with the heating element (3) to increase efficiency.