... for swimming pool1,Inside heat exchanger is made up of stainless tube ,outside is staineless.anti-corrosion ,2, in the sea the basic ... non-toxic .3,suitalbe for heat pump water heater swimming pool series , the hot water temperature to be less than 50degree. heating ... 63Mpa , 1.0Mpa. inside commercial pure titanium in the pressure is less than 5Mpa the compressor system. refrigeration is R22 ,R134,R407 ...