Hot packs should be stored at what temperature range?

• A. 158-167 degrees Fahrenheit
• B. 140-150 degrees Fahrenheit
• C. 180-200 degrees Fahrenheit
• D. 100-110 degrees Fahrenheit

Answer: (A)

Hot packs deliver moist heat, and their safety and effectiveness depend on staying within a temperature range that can transfer heat to tissues without causing burns. The standard storage (or pre-warming) range for hot packs in a hydrocollator is about 158–167°F (70–75°C). This temperature is hot enough to produce therapeutic heating—promoting vasodilation, increased tissue extensibility, and pain relief—yet not so hot that it markedly increases burn risk when the pack is placed over a barrier like a towel and used for a limited duration. Temperatures much higher (around 180–200°F) raise the danger of skin and underlying tissue injury, while temperatures around 100–110°F would be unlikely to provide meaningful therapeutic heat. So, 158–167°F is the best choice to balance efficacy and safety.