Control device for expansion tank and water heater

A method of using an expansion tank control device, the method comprising:

• arranging a water flow sensor in a water inlet waterway of a water heater;
• detecting water flow in the water inlet waterway using the water flow sensor;
• sending a first electric signal after detecting water flow in the water inlet waterway;
• sending a second electric signal after detecting that no water flow exists in the water inlet water way;
• and
• controlling an input end of a controller, wherein the controller is connected to an output end of the water flow sensor and outputs a driving signal after receiving the first electric signal output by the water flow sensor, and outputs a reset electric signal after receiving the second electric signal output by the water flow sensor.

A water heater for an expansion tank control device including an expansion tank, comprising:

• a water inlet waterway;
• a heating tank;
• a venturi pipe arranged on the water inlet waterway, within an opening of the expansion tank;
• and
• one or more water flow sensors,
• wherein the one or more water flow sensors is arranged between a water source and a heating tank, and the one or more water flow sensors further comprises a water pressure sensor or a conductivity sensor,
• wherein the one or more water flow sensors sends out a first electric signal after detecting a water flow in the water inlet waterway, and
• wherein the one or more water flow sensors sends out a second electric signal after detecting that no water flow exists in the inlet waterway.

A water heater for an expansion tank control device including an expansion device, comprising:

• a water inlet waterway;
• a heating tank;
• a venturi pipe arranged on the water inlet waterway, within an opening of the expansion tank control device;
• and
• one or more water flow sensors,
• wherein the one or more water flow sensors is arranged between a water source and a heating tank, and the water flow sensor further comprises a water pressure sensor or a conductivity sensor,
• wherein the one or more flow sensors is arranged between a water source and a heating tank and at the front of the expansion tank, and the water flow sensor further comprises a water pressure sensor or a conductivity sensor, and
• wherein upon receiving a detected signal from the one or more flow sensors, water is released from the heating tank to the expansion tank.