... as evaporator and condensering fucntinos with 1tube in tube heat exchangercoaxial heat exchanger is used in ... heat pumpWork Condition:1)Refrigerant side (Between the tube and shell):R22,R134a,R404a,R407c,R410a,R600a ... 50 Bar.2)Water side (inside of the tube):Domestic water,tap water,antifreeze (glycol solution) ... is on the lowest position ,and easy for drainage in cold season,avoid freeze. This is Dragon ...