The Delta Tube HD is a high density polyethylene floor heating system that is an excellent choice for heating warehouses, retail areas, potting areas and greenhouses. It installs easily, and because the tubing is installed directly into the concrete floor it is never in the way. Special manifolds are concealed in a 2ft x 3ft box in the floor, and no tubing is left exposed. The Delta Tube HD is great for areas where runoff is a concern. Delta T also offers Delta Tube HDPEX tubing to meet the strict codes required in some areas. For systems where an oxygen barrier is required, we offer the Delta Tube HDPEXOX.