Disclosed is a water heater including a case provided with an air supply hole and an air discharge hole, a burner provided in an interior of the case, and a humidified air supply part that provides humidified air to the burner together with a fuel. The humidified air supply part includes a first accommodation tank that accommodates water to generate vapor, and a humidified air supply tank that provides a space for supplying the vapor supplied from the first accommodation tank to air introduced into an interior of the case through the air supply hole.

A condensing heat exchanger (100) capable of lowering a requirement for a fan and a water heater having the same, wherein the condensing heat exchanger (100) comprises: a heat exchanger housing (110) having a flue gas inlet (101) and a flue gas outlet (102); and a heat exchange unit (104) located within the heat exchanger housing (110), wherein a sidewall flue gas exhaust channel (105) communicated with the flue gas outlet (102) is provided between the heat exchange unit (104) and an inner sidewall of the heat exchanger housing (110), the heat exchange unit (104) surrounds a flue gas inlet channel (103) communicated with the flue gas inlet (101), the sidewall flue gas exhaust channel (105) surrounds the heat exchange unit (104), and the heat exchange unit (104) is internally provided with a heat exchange flue which communicates the flue gas inlet channel (103) with the sidewall flue gas exhaust channel (105).

The present disclosure discloses a combustion chamber and a combustion apparatus. The combustion chamber includes: a first surrounding plate located on an outer side and a second surrounding plate located on an inner side. A combustion cavity is defined by the second surrounding plate. The first surrounding plate and the second surrounding plate are spaced apart from each other to define at least one air duct in communication with the combustion cavity. Each of the at least one air duct has an air inlet hole formed in the first surrounding plate, and an air outlet hole formed in the second surrounding plate.

A low gas pressure detection and compensation operation method of a gas water heater according to a preferred embodiment of the present disclosure includes an output calculation step of calculating combustion output through combustion temperature detected by a temperature sensor and comparing the calculated output with a reference output, a flame voltage comparison step of detecting flame voltage and comparing the detected flame voltage with a reference flame voltage when the calculated output is smaller than the reference output, and a correction step of adjusting a supply air amount when the detected flame voltage is smaller than the reference flame voltage.

An exhaust adapter comprises a packing 15 compressed and held between a flange 14 of an exhaust flow path portion 5 and an outer peripheral portion of an exhaust outlet 11, and a sliding guide portion 18 provided on an inner surface of the main body 2 and brought into pressure contact with an outer surface of a closing portion 16 that is an opposing wall of an opening 13 of the exhaust flow path portion 5 are included. The sliding guide portion 18 is formed with a concave arcuate portion 18a inclined in a direction of a side of the exhaust outlet 11 from a distal end side toward a proximal end side, and the exhaust flow path portion 5 is fixed to the main body 2 in a state where the outer surface of the closing portion 16 is formed in a convex arcuate surface 16a and the convex arcuate surface 16a is pushed along the concave arcuate portion 18a of the sliding guide portion 18.