an agitator for stirring the cooling water, the agitator including a blade portion, a motor portion and supporting members supporting said motor portion, said blade portion being disposed inside the coil formed by the cooling pipe, said motor being disposed above a surface of {HEAD ~ the cooling water} and being supported by said supporting members, said supporting members being fixed to {TAIL ~ a bottom} of the cooling water tank, 
an agitator for stirring the cooling water , the agitator including a blade portion , a motor portion and supporting members supporting said motor portion , said blade portion being disposed inside the coil formed by the cooling pipe , said motor being disposed above a surface of { HEAD ~ the cooling water } and being supported by said supporting members , said supporting members being fixed to { TAIL ~ a bottom } of the cooling water tank ,
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