Non pressurized canister system absorbs and holds approximately 1 ¼ quarts of alcohol fuel. The unique design prevents fuel from leaking out, even if it’s turned completely upside down. Reliable and environmentally friendly. Generates 6,800 BTU of heat per burner, each burner can boil a quart of water in 8 minutes and burn for 4 and a half hours per fill. Alcohol Stoves are available in portable and built-in design. Denatured alcohol is a safe environmentally friendly, clean. The burner flame is completely adjustable and turns off with the control knob.