Reusable Therapy - 8"W x 12 1/2"L x 15"H Hydrocollator HotPac & Units - E1 Unit - 8"W x 12 1/2"L x 15"H Perfect for smaller clinics, this stationary, non-insulated unit fits on desktop or mobile stand. Includes four standard HotPacs. Hydrocollator HotPac Introduces Improved Moist Heat Technology with New, Synthetic Fabric Here's an easy way to provide moist heat therapy for patients-quickly, easily and targeted to any point of the body. HotPacs provide up to 30 minutes of moist heat per session. And now, they have a new synthetic covering that helps resist mold and mildew, dramatically increasing their lifespan. You'll get hundreds of treatments from each pack.