A portable efficient heater management system includes an external heat source, a circulation pump that provides the circulation of the water taken from the external heat source, a heat sensor measuring the temperature of the water coming from the heat source, water transfer pipes, a two-section heat exchanger in which the waters in them do not mix with each other, but heat transfer can be made, a pressure gauge, a processor, a heat sensor placed on a generator, a generator circulation pump, a three-way valve. It also provides the engine blocks of diesel-powered generators to be heated with the heat obtained from an external heat source, as long as the heat in the external source is sufficient.