Durable and easy to maintain, these high-quality stainless steel units provide a constant supply of temperature-consistent HotPacs™. Supplied ready for immediate use and requiring no special plumbing, the units feature fiberglass insulation for reducing heat loss and maximizing energy efficiency (except for the E-1 and E-2 heating units) and swivel-type 3 rubber casters for silent, friction-free movement of mobile units.