REHAU RAUPANEL is a lightweight and easy-to-install radiant system suited for retrofit and new construction applications. Consisting of aluminum panels, wood return bends and 3/8–in. RAUPEX O2 barrier crosslinked polyethylene (PEXa) pipe, the system’s relatively low thermal mass results in quicker heating response times. The system provides an effective method of installing radiant heating over concrete slabs and new or existing subfloors. The system’s low 5/8-in. profile has minimal impact on overall floor height and flexible pipe spacing (6 or 8 in. on-centre), making it suitable for a variety of installations.