Patent ID: 8286666

Claim:
A mixing pipe for a gas heater, comprising: an intake port through which gas and air are flowed in; a discharge port through which the gas and the air flowed in through the intake port are mixed and discharged; an acceleration part disposed between the intake port and the discharge port and having a diameter smaller than a diameter of the intake port; an upper panel provided with a first curved part which is upwardly bulged; and a lower panel provided with a second curved part which is downwardly bulged to correspond to the first curved part; wherein a joining part formed by joining the upper panel and the lower panel has a bended part formed by bending joined ends of the upper panel and the lower panel in one direction; wherein a distance between the intake port and the acceleration part is greater than 0.5 times of the diameter of the acceleration part and smaller than 1.5 times of the diameter of the acceleration part.