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. Model E-2 Heating Unit: Complete with 2 Oversize 15'' x 24'' (37cm x 60cm), 3 Standard 10'' x 12'' (25cm x 30cm) and 1 Neck Contour 24'' (60 cm long) HotPacs. A smaller, non-insulated heating unit with the capacity for Oversize HotPacs.