Water heater assembly for a refrigerator appliance and a method for operating the same

1. A refrigerator appliance, comprising:

a cabinet defining a chilled chamber, the chilled chamber of the cabinet configured for receipt of food items for storage, the cabinet having a door, the door configured for permitting selective access to the chilled chamber of the cabinet;

a water heating assembly comprising

a tank defining a heating chamber and an expansion chamber, the tank having a flow conduit that extends between the heating chamber and the expansion chamber, the tank also having a vent that permits air to enter and exit the expansion chamber, the expansion chamber configured for holding at least six ounces of water therein;

a check valve positioned within the expansion chamber at an opening of the flow conduit;

an air valve mounted to the tank at the vent of the expansion chamber, the air valve adjustable between an open configuration and a closed configuration, the air valve permitting a flow of air through the vent when the air valve is in the open configuration, the air valve obstructing the flow of air through the vent when the air valve is in the closed configuration;

a heating element mounted to the tank and positioned within the heating chamber of the tank;

an air pump coupled to the tank at the expansion chamber of the tank and configured for selectively directing air into the expansion chamber;

an inlet conduit configured for directing liquid water into the heating chamber of the tank;

an outlet conduit configured for directing liquid water out of the heating chamber of the tank; and

a brewing module, the outlet conduit extending between the tank and brewing module in order to direct heated water from the heating chamber of the tank to the brewing module, an inlet of the outlet conduit positioned within the heating chamber of the tank, the inlet of the outlet conduit spaced apart from a top wall of the tank such that a particular volume of heated water from the heating chamber disposed above the inlet of the outlet conduit is dispensed from the heating chamber during operation of the air pump.

2. The refrigerator appliance of claim 1 , wherein the water heating assembly further comprises a water valve coupled to the inlet conduit, the water valve is configured for selectively adjusting between an open arrangement and a closed arrangement, the water valve permitting a flow of water into the heating chamber through the inlet conduit when the water valve is in the open arrangement, the water valve obstructing the flow of water into the heating chamber through the inlet conduit when the water valve is in the closed arrangement.

3. The refrigerator appliance of claim 1 , wherein the expansion chamber is positioned above the heating chamber.

4. The refrigerator appliance of claim 1 , wherein the vent is positioned at a top portion of the expansion chamber.

5. The refrigerator appliance of claim 1 , wherein the air pump is mounted to the tank at the vent.

6. The refrigerator appliance of claim 1 , wherein the check valve is a floating ball check valve.

7. The refrigerator appliance of claim 1 , wherein the inlet of the outlet conduit is disposed vertically below the top wall of the tank by a height, the height selected such that air from the air pump dispenses a particular volume of heated water from the heating chamber of the tank during operation of the air pump when the check valve is open.

8. The refrigerator appliance of claim 7 , wherein the check valve is a solenoid valve.

9. The refrigerator appliance of claim 8 , wherein the inlet of the outlet conduit is positioned to receive air from the air pump after the particular volume of heated water is dispensed.

10. The refrigerator appliance of claim 9 , the air valve is spaced apart from the check valve on the tank.

11. The refrigerator appliance of claim 1 , wherein the air valve is separate from the air pump on the tank.