... heat transfer ability.Suitable for R22, R134a, R410a,, R407cWorking temperature: -10~50°CModelHeatWater flow rateTube DiameterWater ConnectionRefrigerant In/Out KWm*m ... (PPR) -15°C~120 (Stainless steel)Water/sea water/antifreeze 10.5kw Spa pool heat pump heat exchanger