Gas boiler waste heat recovery system

The utility model discloses a gas boiler waste heat recovery system, including boiler and flue, flue heat exchanger has been arranged in the flue, the waste heat recovery system is still including thewater storage tank, intake end and the water supply tank and/or the condensate water recovery tank of water storage tank correspond the boiler water supply union coupling that water end (W. E. ) andboiler are connected, are gone out to the supply channel, just the water storage tank with be connected with between the flue heat exchanger and trade heat water inlet pipe and heat transfer outlet pipe, trade heat water inlet pipe, flue heat exchanger and heat transfer outlet pipe and constitute the waste heat utilization return circuit between water storage tank and the flue, make the flue gas heat heating in by the flue of water in the water storage tank, realize the heat exchange through the waste heat utilization return circuit. The utility model discloses the effective fuel saving of ability, reduction in product