The invention discloses a multifunctional heat dissipation device belonging to the technical field of building heating, particularly relates to a device for heating household water by utilizing concentrated heating, and aims to solve the technical problems and provide the device which is simple in structure, is safe in use and can realize the purpose of heating the household water by utilizing the concentrated heating. The technical scheme of the invention is that the multifunctional heat dissipation device comprises a tank body, a tank cover and a heat dissipation device, wherein the heat dissipation device is fixedly arranged at the inner part of the tank body and is connected with an external concentrated heating pipeline; the side wall of the tank body is provided with a water inlet pipe, and the water inlet pipe is connected with a cold water float valve which is arranged in the tank body; the lower part of the tank body is externally connected with a hot water outlet valve; the tank cover is provided with multiple air vents. The multifunctional heat dissipation device disclosed by the invention has the advantages that the structure is simple, the installation is easy, and great convenience is brought for daily life of residents.