Thanks to its patented geometry it has the highest efficiency compared to the competition
Stainless steel has a higher heat exchange coefficient compared to plastic materials (i.e. polyurethane). So this means that for having a fixed efficiency you need a smaller heat exchange area with stainless steel than polyurethane.
Blood is inside the pipes. The pipes inner diameter and the number of pipes has been chosen for reducing the blood side pressure drop and optimizing the heat exchange area. that air, acting like a interface, reduces the heat exchange)
No risk of H2O2 migration from water side to blood side.