Heat entire Camwarmer® unit in oven. Do not separate pellet or covers for heating. Do not remove pellet from Camwarmer trays after heating. Heat un-stacked Camwarmers in oven for 45 minutes at maximum of 350ºF (177ºC). When heating 2-3 stacked Camwarmers in the same oven, heat for 2 hours at 350ºF (177ºC). Pellet is extremely hot once heated. Handle only with protective oven mitts or gloves. Place Camwarmer on bottom rails, on bottom sheet pan, or on side rims of food pan. Place one heated Camwarmer per compartment to preheat cavity in preparation of food transportation. Place two heated Camwarmers per compartment and preheating is no longer necessary. Remove bottom food pan first for serving and move both Camwarmers up as each pan is removed. Do not place heated Camwarmer directly onto bottom of compartment. May cause permanent damage to plastic. Do not heat more than 5 stacked Camwarmers in the oven at once. Uneven and inadequate heating will occur. Do not heat for more than 5 hours at a time. Ships from CA, IA.