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Home built in 1955, just moved in, space heater use causes circuit box to trip and cut off electricity, why? - space heaters cause breaker to trip

This is not a technical person. He said that the owners of insurance and requires an update of the central banks outside the home. Inspector said it was done. He bought the house moved, but I suspect that these updates only given the option to make an interior renovation, which was not done.

Thus, the 1500-watt space heater-based services, which requires 12.5 amps 120V outlet. The heater circuit breaker trips a few minutes of ignition. We can not heating. Why? and what is the solution that I can handle the heat for my house?