Importance

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Abstract

Disclosed are an instantaneous boiler and a double pipe heat exchanger for the instantaneous boiler supplying heating water and hot water, which can obtain hot water output larger than heating water output, simultaneously use the heating water and the hot water, and have a simple piping structure. The heat exchanger includes: an outer pipe used for a hot water pathway, to which combustion heat is directly transferred from a burner in a combustion chamber; and an inner pipe used for a heating water pathway and extending through the outer pipe. The boiler includes: a heat exchanger including an outer pipe used for hot water pathway, to which combustion heat is directly transferred from a burner in a combustion chamber, and an inner pipe used for heating water pathway, which extends through the outer pipe; a heating water supply pipe connected to the inner pipe of the heat exchanger; a heating water line connected to the heating water supply pipe; and a heating water returning pipe connected to the inner pipe, wherein the inner pipe of the heat exchanger, the heating water supply pipe, the heating water line, and the heating water returning pipe are connected to one another in series.

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First Claim