As noted above, most electric heaters are 1,500 watts or about 12 amps at 120 volts. This is irrespective if they are oil heaters, ceramic heaters or whatever.
But if you want to run two heaters at the same time, you need to plug them in to two separate outlets served by independent breakers. The 15A breaker that typically protects outlets will blow with 24 amps from two heaters at the same time on it.
So plug in one heater and turn it on, then look for the breaker that serves it. Then find another outlet that is served by a different breaker for the other heater. 50A shore power will easily cover the total amperage of two heaters at once as long as they are on separate breakers.
David
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