Power switching equipment for boilers used within regulated water heating using direct current from photovoltaic panels consists of two contactors (ST1, ST2), a thermal fuse (TP), thermostat (T), heating elements (R), two signal devices (S1, S2) and wiring terminals (X1, X2, X3, X4, X5, X6, X7). The equipment uses both direct (DC) as well as alternating (AC) current. The positive pole of the direct current power source (DC) is directed to the main terminals of both contactors (ST1, ST2). Contactor coils are used to switch the direct current (DC) between contactors (ST1, ST2)； these coils are powered by alternating current (AC) which passes through the thermostat (T) and the thermal fuse (TP) before reaching the coils.
