... are Unitary type,With Coaxial Coil Heat Exchangers in side of the main machine, the hot water comes from main machine directly.Heat Exchanger ... for KRS012, KRS018/S(Z),is Plate-type type Exchanger, Exhanger of ... , once water temperature comes down, it would stop supply waterAll the FOB prices are for units with R22 refrigerant, please plus ...