Heating device capable of effectively avoiding overhigh water level

The invention discloses a heating device capable of effectively avoiding a overhigh water level, and belongs to the technical field of heating devices. The device comprises a heater shell, wherein aninner container is arranged in an inner cavity of the heater shell; a buffer cavity is formed between the outer wall of the inner container and the inner wall of the heater shell; a water outlet is formed in the bottom of the right side of the buffer cavity by penetrating the heater shell; a plug is clamped in the inner cavity of the water outlet; a through hole is formed in the top of the left side of the inner wall of the inner container in a penetrating manner; and a spout is arranged between the heater shell and the top of the left side of the inner container in a penetrating manner. According to the device, a floating ball drives a counterweight ball to float from the upper part of a check ball to the water surface, when the water in the inner container exceeds the position of the through hole, the water in t