Iwatani Hot Plate, Portable Single Burner - Butane - VA-30Portable Butane Stove Heat panel: Iwatanis patented heat panel system draws heat from the center flame to the butane canister. This patented systems correctly maintains constant pressure as the fuel is consumed, correlating a higher BTU output versus stoves with no heal panel system. This system also allows the stove to utilize the entire can of butane leaving no residual unused butane fuel, assuring greater economical and environmental standards