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Pack of 5 Flameless Ration Heaters Turn A Wet Cold Meal in to a Self Heating Hot Meal in 10min Transforms a Wet Rations Meal into a Self Heating Meal. Single use. Flameless ration heater, or FRH, is a water-activated exothermic chemical heater used to heat the food. US military specifications for the heater require that it be capable of raising the temperature of an eight-ounce main meal by 100° F in twelve minutes, and that it display no visible flame. Use this disposable ration heater to heat any of the expedition wet main meals, desserts or breakfasts. To use, simply insert the unopened meal bag in the heater pouch and add water. Wait twelve minutes and your meal is ready to eat.