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1. A double-circuit electric boiler, comprising: a power supply system, control elements, a housing (5) having inside a container (1) for a water of a hot water supply circuit and a container (2) for a heat-carrying agent of a warming circuit, wherein at least one electric heater (3) of the heat-carrying agent of the warming circuit is mounted inside the container (2), and each of said two containers (1), (2) comprises an inlet (9,11) and an outlet ducts (8,10), and the container (1) for the water of the hot water supply circuit comprises a heat insulation layer (4), characterized in that the container (2) for the heat-carrying agent of the warming circuit, along with the at least one electric heater (3) of the heat-carrying agent of the warming circuit mounted in the container (2), is mounted and sealably and rigidly secured inside the container (1) for the water of the hot water supply circuit such that one of surfaces of the container (2) for the heat-carrying agent of the warming circuit is an outer wall (7) that is disposed and secured outside the container (1) for the water of the hot water supply circuit such that an inner surface (29) of the outer wall (7) is in a contact with a mounting wall (16) of the container (1) of the hot water supply circuit, and an outer surface (30) of the outer wall (7) is disposed outside the container (1) of the hot water supply circuit, wherein the outer surfaces of inner walls (6) of the container (2) of the heat-carrying agent of the warming circuit that is disposed inside the container (1) for the water of the hot water supply circuit are in contact with the water of the hot water supply circuit inside the container (1) for the water of the hot water supply circuit, furthermore, the at least one electric heater (3) for the heat-carrying agent of the warming circuit is fully isolated by the inner walls (6) of the container (2) of the warming circuit from a contact with the water of the hot water supply circuit that is disposed inside the container (1) of the hot water supply circuit, wherein the outlet duct (8) for drain of the heat-carrying agent from the container (2) of the warming circuit and the inlet duct (9) for supplying the heat-carrying agent into the container (2) of the warming circuit are sealably mounted and secured in technological openings of the outer wall (7) of the container (2) of the warming circuit, and their end openings are sealably coupled to the corresponding technological openings of the container (2) of the warming circuit inside the container (1) of the hot water supply circuit, and an outlet duct (10) for drain of the water from the container (1) of the hot water supply circuit and an inlet duct (11) for supplying the water into the container (1) of the hot water supply circuit are sealably mounted and secured in the corresponding technological openings of one of the walls of the container (1) of the hot water supply circuit such that their end openings are disposed inside the container (1) of the hot water supply circuit and areas of these outlet (10) and inlet (11) ducts, which are disposed inside the container (1) for the water of the hot water supply circuit, are fully isolated by the inner walls (6) of the container (2) of the heat-carrying agent of the warming circuit from a contact with the heat-carrying agent in the container (2) of the warming circuit, furthermore, inside the container (2) of the warming circuit, there is mounted a temperature sensor (12) for the heat-carrying agent in the container (2) of the warming circuit such that this temperature sensor (12) is fully isolated by the inner walls (6) of the container (2) from a contact with the water in the container (1) of the hot water supply circuit, and inside the container (1) of the hot water supply circuit, there is mounted a temperature sensor (13) for the water in the container (1) such that this temperature sensor (13) is fully isolated by the inner walls (6) of the container (2) from a contact with the heat-carrying agent in the container (2) of the warming circuit.
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