An efficient heating management system integrated into a diesel engine generator that enables heating of engine block water using heat obtained from an external heat source, comprising a circulation pump, a heat sensor that measures a temperature of water coming from the external heat source, water transfer pipes, a two-part heat exchanger where the waters do not mix but heat transfer is allowed to be performed, a pressure gauge, a flow sensor, a heating efficiency system control unit further or an internal control device of the generator comprising a screen with an interface and a processor configured for the efficient heating management system, a heat sensor on generator, a generator circulation pump, a three-way motorized and/or non-motorized valve and a reporting module.