Ice making assembly for a refrigerator appliance

A refrigerator appliance defining a vertical direction, a lateral direction, and a transverse direction, comprising:

• a cabinet defining a chilled chamber;
• a door rotatably mounted to the cabinet and rotatable between a closed position enclosing the chilled chamber and an open position providing access to the chilled chamber;
• and
• an ice making assembly comprising:
• an icemaker frame assembly defining an ice making chamber;
• an ice tray mounted to the icemaker frame assembly and defining a plurality of mold cavities for receiving water that is formed into ice;
• a fill tube for selectively supplying the water into the ice tray;
• and
• a heating assembly comprising a heating element and a heat sink that are thermally coupled to the fill tube, wherein the heating element is selectively energized to heat the water flowing through the fill tube and the ice making chamber, wherein the heat sink comprises a first portion and a second portion that are clamped onto the fill tube over the heating element.