The utility model relates to a multipurpose boiler for water supplying and heating, belonging to the field of heating boilers. The utility model is composed of a hearth, a flue and a water tank. The upper part of the hearth is communicated with the flue, the water tank which is positioned out of the hearth and the flue is divided into an upper part and a lower part by a spacer plate. The upper and the lower water tanks have independent water inlet pipes, water outlet pipes and pollution discharging pipes, and the upper and the lower water tanks can be communicated with each other to be used for concentrated water supply simultaneously. The utility model not only can accomplish the simultaneous supply of heating water and drinking water, but also can finish concentrated supply when certain consumption is increased. The utility model has the conspicuous characteristic of multiple functions.