Hydrocollator heating units remain the brenchmark against which all others are judged. Durable and easy to maintain, these high quality stainless steel units have an almost indefinite life and ensure a constant supply of the exact temperature for the Hot Packs.Heating units include: High-quality stainless steel. Thermostatically controlled temperature. 3" (8 cm) swivel-type rubber casters for silent, friction-free movement of mobile units. Easy maintenance. Simple to fill and drain. No plumbing required. UL listed and CUL listed (120 volt). Dimension (H x L x W) SS-2: 33" x 21" x 16" (84 x 53 x 41 cm) M-2: 33" x 27" x 16" (84 x 67 x 41 cm) M-4: 33" x 35" x 20" (84 x 89 x 51 cm)Importantnote: Additional shipping fees may apply depending on your geographic locationand your needs/options. Examples: Indoor delivery, tailgate, appointmentscheduling, or restricted access.