Watts from a socket is dependant upon what the load connected draws. The maximum capacity from a socket is calculated by the following equation, W = A x V. So the maximum wattage you are able to draw from the socket before the fuse blows is W = 13 x 220 = 2860.
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The power is 220 x 13 watts into a load like a convector heater (or similar load that has a good power factor).
A 20-amp GFCI outlet would be best for 1600 watts, as it can handle up to 2400 watts at 120 volts. Make sure to check the manufacturer's specifications for the specific outlet to ensure it can safely handle the load.
The 2 amp (about two hundred watts at household voltage) difference isn't that significant so the construction of the sockets should not differ greatly unless they are made of different conducting materials (aluminum/copper). The 15A socket should have thicker contacts or wiring to support the extra amperage or better construction to conduct away the extra heat that might be generated.
The power available from a 110 VAC outlet can be calculated using the formula P = V x I, where P is power in watts, V is voltage in volts (110V in this case) and I is current in amps. The maximum power output can be estimated as 1100 watts for a standard 110 VAC outlet.
In the United States, a typical wall socket in a house is designed to deliver a maximum of 120 volts at 15 amps, which equals 1800 watts. However, it is recommended to not exceed 80% of this capacity for continuous use to prevent overheating and potential fire hazards.
A typical 15-amp, 115-volt residential outlet can handle up to 1,725 watts (115 volts * 15 amps). However, it's recommended to leave some margin and avoid continuously drawing the full capacity to prevent circuit overloading.