| 摘要 |
An instantaneous electric water heater 10 having a heat exchanger comprising two electrical heating elements 14, 15. Each heating element 14, 15 is a double helix. One double helix 15 has a smaller diameter and is disposed within the other 14, coaxially. The elements are contained within a chamber 12. The heating elements 14, 15 may have a return configuration, such that the free ends 14a, 14b, 15a, 15b of both are at the same end of the chamber 12. Also provided is an electric shower comprising the heater 10, and a baffle 20or flow directing element to ensure the water flows substantially in line with the axis of the heating elements 14, 15. |
