Noise reduction and rapid heat storage for vacuumed electric water heater using multiple heaters (basic characteristics for heating-up and heat storage).

The article features the experiments conducted on the significance of noise reduction in vacuumed electric water heater in Osaka, Japan. It is revealed that eventhough heat storage of electric water heater is vital it is necessary to add the function of rapid heat storage. Results of the experiment show that the duration time for rapid heat storage can be reduced to 1/4 and the noise can be reduced by 17 decibels.