Smoke discharging system subassembly for gas water heater

The utility model provides a smoke discharging system subassembly for a gas water heater. The smoke discharging system subassembly for the gas water heater comprises a smoke collection cover and a fan. The fan comprises a volute, a wind wheel and a motor, and a rear worm plate of the volute and a circumferential shell are integrally formed to form a worm body. A tongue portion is arranged on an air outlet, the tongue portion and the installing position of the rear worm plate are fixedly connected with the circumferential shell, and a rivet penetrates through the tongue portion and a front worm plate and is connected with a turnup in a rivet mode. A connecting plate is arranged on the tongue portion, and the rivet is riveted with the connecting plate and the turnup. The smoke collection cover comprises a left shell body and a right shell body, the left shell body is provided with a lower opening and a right opening, the right shell body is provided with a lower opening and a left opening, the left shell body a