Storage water heater equipped with at least one auxiliary heater and a circulator

A water heater apparatus comprising:

• at least one water heater;
• at least one storage tank adapted to store water;
• at least one control and management unit adapted to check said at least one water heater;
• at least one inlet duct connected to said at least one storage tank so as to allow water to be introduced into said at least one storage tank;
• and
• at least one outlet duct connected to said at least one storage tank so as to allow water from said at least one storage tank to be withdrawn therethrough, wherein said at least one water heater comprises at least one main heater and at least one auxiliary heater, said at least one auxiliary heater being installed on said at least one inlet duct so as to act as a pre-heater of the water passing therethrough or on said at least one outlet duct so as to act as a post-heater the water passing therethrough, wherein said at least one water heater has at least one circulator defined by a hydraulic connection duct for a recirculation of the water in said at least one storage tank, said at least one circulator adapted to recirculate the water between a lower part and a top part of said at least one storage tank by passing through said at least one auxiliary heater.