Product Focus: Radiant Heating Systems Issue: 9/01 RAUPEX (REHAU PEX-a) pipe provides superior heating comfort and performance as a clog and corrosive-resistant cross-linked polyethylene product in REHAU's hydronic Radiant Floor Heating system. The system also includes nickel-plated brass EVERLOC fittings, pre-assembled brass manifolds, modern controls, and RFH WarmSource software. REHAU Radiant Floor Heating systems are ideal in numerous applications, including commercial, residential, new construction, restoration and remodeling projects. REHAU Inc.