Zurn PEX, a division of Zurn Plumbing Products Group, offers its Thermal Track™ modular radiant heating panels, grooved panels that are used in underfloor radiant heating systems. The grooves in the Thermal Track panels hold the 3/8" ZurnPEX cross-linked polyethylene tubing used in radiant heating systems. The panel itself allows for the efficient transfer of heat to the floor. ZurnPEX tubing easily snaps into the Thermal Track panels' grooves. Thermal Track's smooth surface allows for the easy attachment of flooring. Zurn Plumbing Products Group. Circle 24.