Chattanooga® Hydrocollator® Heating Unit is durable and easy to maintain, made of high-quality stainless steel, and thermostatically controlled to maintain temperature at 165 degrees F. Full fiberglass insulation ensures minimum energy use and prevents heat loss. Simple to fill and drain with minimal maintenance and no plumbing required. Available in four models: Desktop, Economy, Standard, or Deluxe with or without 3" swivel-type friction-free rubber Casters.Desktop E-2 (Without Casters): Includes (2) Oversize, (3) Standard, (1) Cervical HotPac • Exterior: 13"W x 15"L x 20"H • Tank capacity (approx. with HotPacs): 8 gallons • Product weight: 29 lbs. Economy SS-2 (With Casters): Includes (8) Standard HotPacs • Exterior: 16"W x 21"L x 33"H • Tank capacity (approx. with HotPacs): 10 gallons • Product weight: 66 lbs. Standard E-1 (Without Casters): Includes (4) Standard HotPacs • Exterior: 8"W x 13"L x 16"H • Tank capacity (approx. with HotPacs): 3 gallons • Product weight: 15 lbs. Standard M-2 (With Casters): Includes (12) Standard HotPacs • Exterior: 16"W x 27"L x 33"H • Tank capacity (approx. with HotPacs): 14 gallons • Product weight: 48 lbs. Deluxe M-4 (With Casters): Includes (24) Standard HotPacs • Exterior: 20"W x 35"L x 33"H • Tank capacity (approx. with HotPacs): 27 gallons • Product weight: 132 lbs.