SWEP Sealix® is a new BPHE range that feature a protective layer on all inner surfaces of the BPHE, resulting in enhanced behavior in terms of metal leaching, scaling, fouling and corrosion while maintaining thermal and hydraulic performance. The SXB28 combines Sealix® features with a specially designed product that covers the capacities and specifications of district heating substations, radiator circuits and tap water heating applications over a wide capacity range. All parts in contact with water are covered by the SiO₂-based layer.