The original gel fuel that crackles just like a real fire! Each can burns up to three hours long at 3,000 BTUs. Although not designed as a heating source, Real Flame? gel fuel does provide warmth. Environmentally friendly, non-toxic and safe to burn indoors or out. Real Flame? fuel is pure gelled alcohol that is safe and tested for use in Real Flame? fireplaces and related products. Made from premium ingredients, Real Flame? gel fuel is the leading brand in the market.