The E-2 is a small heating unit with the capacity for Oversize HotPacs. Includes two Oversize, one Neck Contour and three Standard HotPacs. Hydrocollator Heating Units remain the benchmark against which all others are judged. 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, this unit features a low water cut-off and is easy to fill and drain.