The present invention relates to a water trap for dewatering and draining condensed water generated from a heat exchanger of a boiler. A plurality of partitions are provided inside the water trap, and each partition is provided with a detachable filter having a hole formed at one side thereof. The hole position of the filter is alternately provided to the upper side and the lower side to increase the time for condensate to stay in the water trap so that the condensate can be sufficiently neutralized, and the manufacturing cost is reduced because the filters provided in each partition are all manufactured in the same shape. It is a water trap for a boiler having an effect.;Water traps, bulkheads, filters, condensate
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