Gas cooler for use in hot water supply system has inner side tubes that comprises inner side pipe line which mutually exist in predetermined interval and extend in parallel

摘要

An outer-side pipe line (26) provided with a spiral groove (30) and with which the water of the hot water supply unit flows, surrounds the inner side pipe line (28) with which the refrigerant of a heat pump unit flows. The inner side pipe line is formed from two inner side tubes (32) which mutually exist in predetermined interval and extend in parallel.