A food heating apparatus includes a main tank, a water exhaust tank, reserve tanks, communication chambers, heat insulating partition walls, a water exhaust tank and pressure exhaust pipes. The main tank stores water exceeding 100° C. The reserve tanks communicate with the main tank and imparts hydraulic head pressure to the water in the main tank. The communication chambers are respectively between the main tank and the reserve tank and have top plates higher than a top plate of the main tank. The heat insulating partition walls separate the main tank and each reserve tank and protrude into the front communication chamber. The water exhaust tank higher than the communication chambers has an upper surface higher than water surfaces of the reserve tanks. The pressure exhaust pipes have inlet openings in the top plates of the communication chambers and outlet openings within the water exhaust tank higher than the water surfaces.

A food heating apparatus includes a main tank, a water exhaust tank, reserve tanks, communication chambers, heat insulating partition walls, a water exhaust tank and pressure exhaust pipes. The main tank stores water exceeding 100° C. The reserve tanks communicate with the main tank and imparts hydraulic head pressure to the water in the main tank. The communication chambers are respectively between the main tank and the reserve tank and have top plates higher than a top plate of the main tank. The heat insulating partition walls separate the main tank and each reserve tank and protrude into the front communication chamber. The water exhaust tank higher than the communication chambers has an upper surface higher than water surfaces of the reserve tanks. The pressure exhaust pipes have inlet openings in the top plates of the communication chambers and outlet openings within the water exhaust tank higher than the water surfaces.