... tube 3. Compact design 4. R22, R410a,R407c,R134a Heat pump heat exchangers are made of top quality titanium pipes using advance PVC ... , PP-R, stainless steelExcellent PVC plasticCompact design with high heat transfer ability.Suitable for R22, R134a, R410a,, R407cWorking temperature: -10~50°CModelHeatWater ... (Stainless steel)Water/sea water/antifreeze 10.5kw Spa pool heat pump heat exchanger