| 摘要 |
an internal casing with an exhaust in upper side and an air inlet in lower side; a lower water tub installed in lower part of the internal casing and connected with a hot water outlet pipe; a heat source installed in the bottom of the lower part water tub; a heated air guide means for guiding the air; a flow water pipe for guiding the water; and an exhaust means for inhaling heated air and guiding the air to the exhaust after passing the process of heat exchange with the water.
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