Outstanding features are a densely packed tubular bundle in a thermally insulated primary chamber. The small volume of the chamber and large surface area of the internal tubing provides superb heat transfer efficiency and minimal energy loss. The shell is made of AISI 316L (V4A) (EN 1.4432) stainless steel and enclosed by a rigid thermal casing made of aluminium. A plastic filling in between guarantees optimal isolation and best possible efficiency. The Smart heat exchanger can be installed in the opposite way as well (primary <-> secondary side) in case of eg. low flow.