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Heat storage type of electric water heater has a practical useful aspect. But it is still necessary to reduce the noise at boiling and to add the function of rapid heat storage. Therefore, a new heating method is proposed where both the main heater installed at the bottom and the sub one installed at the top are used. We examined in detail the basic characteristics of two heaters for heat storage and the noise when using them. Experimental results show that the duration time for rapid heat storage can be diminished to 1/4 and the noise can be reduced by 17 dB. It is found that this proposed method is useful for industrial application.

nihon kikai gakkai ronbunshū. c

Noise Reduction and Rapid Heat Storage for Vacuumed Electric Water Heater Using Multiple Heaters (Basic Characteristics for Heating-up and Heat Storage)