Abstract: A combustible product of various shapes and compositions efficiently and conveniently supplies heat, such as for outdoor cooking. The product includes a hollow cone of combustible material defining a substantially cone-shaped exterior, a substantially cone-shaped interior space, a large opening in the base of the cone and a small opening in the top of the cone creating a flue to facilitate ignition of the product and to allow individual products to be stacked upon each other for larger heating requirements or for efficient storage before use. The product may be a single integral piece of combustible material, a plurality of combustible pieces secured to each other to form the cone shape, or a plurality of combustible pieces arranged into a cone shape through means of combustible packaging.