Therma-Fuel Indoor/Outdoor Emergency Flame- 20+ Year Shelf Storage Life- 4 Hour Hot Burn/Can- Survival Heat, Light, Fire, Cooking, Camping, Chafing 4 Hour Hot Burn Time per Can - Clean Burning - Boils 1.5 Quarts of Water In Approx 20 Minutes - Diethylene Glycol Smokeless and Odorless - Safe for Indoor or Outdoor Use - Emits No Toxic Fumes like Carbon Monoxide 20 Year Plus Shelf Life - Shelf Stable - Safe to Ship - 4-Wick System delivers Consistent Heat Level without Fluctuation Re-Usable. Use flame when needed, extinguish when finished. Reseal Cap for Storage - Re-light when needed Perfect for Emergency Preparation Supplies, Hiking, Camping, RV, Power Outage, Cooking, Chafing Dish & More