... titanium tube 3. Compact design 4. R22, R410a,R407c,R134a Heat pump heat exchangers are made of top quality titanium ... -R, stainless steel.They passed 4.5Mpa pressure and leaking testing.Pure titanium Seamless tube, or PVC-U, PP-R, ... plasticCompact design with high heat transfer ability.Suitable for R22, R134a, R410a,, R407cWorking temperature: -10~50°CModelHeatWater flow rateTube DiameterWater ...