PURPOSE: A water trap for a boiler is provided to prevent condensate from backward flowing from a compartment to a heat exchanger by forming a second inlet unit. CONSTITUTION: A water trap for a boiler comprises a main body(10), a cover(20), and a second inlet unit(30). The main body comprises a water containing unit(11), a filter unit(12), and a drainage unit(13). The water containing unit accepts condensate flowing from a heat exchanger of a gas boiler and neutralizes the condensate using a neutralizing agent. The filter unit filters impurities through filters(121) and vertically moves the condensate. The drainage unit discharges the condensate to the outside. The cover has a first inlet(21) for flowing the condensate from the heat exchanger to the main body. The backward flowing condensate re-flows into the main body through the second inlet.
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