This situation typically requires 23.33 kilowatt hours of electricity.
Heating 1 cubic meter of water from 10 degrees to 50 degrees requires approximately 4,200 x 1,000 x 40 = 84 MJ of thermal energy. Under ideal conditions, this requires 23.33 kilowatt hours of electricity, which takes approximately 15.56 hours.
However, the actual heating time and power consumption are affected by many factors, such as the thermal efficiency of the heating tube (usually higher), the thermal capacity of the water tank itself same (because the tank is also heated with the water), water heating. The amount of heat dissipated during the process (depends on the insulation performance of the heating vessel), power supply conditions, etc. Additionally, the specific heat of water is not a constant value.