Moist heating pads vary in type and style. While a physical therapist may employ a hydrocollator to heat pads like Chattanooga Hydrocollator Packs - HotPac Moist Heat Packs & Steam Packs, others are designed to be plugged into a standard wall outlet or can be easily heated in a microwave. The Thermophore MAXHeat Moist Heating Pad is easy to use; simply plug it in, choose either a low, medium or high heat setting and apply. Heating pads like the Relief Pak Moist Heat Packs are microwave safe and used in either a home or professional setting. All moist heating pads, whether heated electrically, at home or in a clinician’s controlled water bath, should be applied with care. To avoid burns, always use a towel, cover or protective layer between the affected area and the heated device. Please avoid applying heat therapy to bruised, swollen, infected or broken skin.