Expansion tank for atmospheric open gas boiler

摘要

The present invention relates to an air-opening type gas boiler, and more particularly, to an air-opening type gas boiler for an air-warming type gas boiler which can prevent inflow of heating water from rising in a water tank, The present invention relates to an expansion tank for suppressing the occurrence of a reduction in the pump capacity due to an increase in the amount of suction to the expansion tank and a boiling noise in the heat exchanger, A standing pipe 10 having a plurality of outflow holes 11 is provided in the periphery so that inflow heating water is prevented from rising above the water surface and a protruding tube portion 12 for suppressing the foreign substance suction on the floor is provided in the water return outlet 2 ' .