This invention relates to a heat-supply device, which includes the heat conduct external pipe, the heat conduct inner pipethe heat conduct that inserts the heat medium between the heat conduct external pipe and the heat conduct inner pipe to form the heat siphon tube, wherein the matrix active carbon fiber heating tube that uses the matrix active carbon as the heat source is inserted into the heat conduct inner pipe, the heat conduct inner pipe connects with the small-sized boiler. This invention decreases the resistance and the electricity consuming quantity to a maximum limit, and by using low voltage and least warm water, it produces a large quantity of high heat. |