ELECTROTHERMAL COGENERATION SYSTEM

PROBLEM TO BE SOLVED: To eliminate disadvantages found in an electrothermal cogeneration system that hot water supply function cannot be used unless water filling in a hot water storing tank is completed, water filling in a hot water storing tank requires judgement whether or not the water filling in the hot water storing tank is completed, non-completion of water filling requires inputting instruction of starting water filling in the hot water storing tank in reference to menus, resulting in burdening much amount of operation to an operator.SOLUTION: In the case that a water filling in a hot water storing tank is not completed, if a system detects that a user performed any of key-operations at an operating part, the system displays a method for filling hot water at a display unit to inform an operator that the filling hot water is necessary and at the same time clearly indicates the method. Further, if the system detects any of the key operations, the operator starts to fill water in a hot water storing tank.