Forced to exhaust their water heaters and heating systems with forced-strong emission water heaters the same, but there are significant differences exhaust combustion system. Cold water flow from the water pipe introduced through the filter, the water flow into the tank valve induction heat exchangers, heat exchanger heated by hot water becomes. After entering the gas water heater by double solenoid valves, flow control valve into the after burners. Air required for combustion from the outside by a blower forced inhalation. Gas - air mixture is ignited in the burner fire hole, forming a stable flame. High temperature gas cooled by the heat exchanger is discharged outside the system from the exhaust pipe. Compared with the strong emission-type water heaters, a distinctive feature of its structure there are two: First, a closed combustion system, the second is to use sleeve-type exhaust pipes. Water heater shell is closed, the combustion air from outside into the suction outlet, Canon closed suction tube into the heater housing, and then from the blower into the sealed combustion chamber required, flue gas exhaust pipe forcibly discharged to the outside.