At 1500 Watts, you have a 12.5 amp draw going through that circuit. Your circuit breaker should be a 20 amp breaker, I'm guessing. The thermal overloads on the circuit breaker at 12.5 amps are fine and should remain cool. Your cord on your heater is rated for above 12.5 amps and it is 100% normal for it to run warm. The manufacturer doesn't want to give you any more copper than necessary. It is when other appliances are plugged into the same circuit as your heater is when your circuit breaker will become stressed as it approaches it's 20 amp limit. Once the thermal overloads trip a circuit breaker is when greater concerns should arise. You need to get some stuff off of that circuit. Also once a thermal overload trips a circuit breaker, it will reduce it's ampacity rating. Not by much but it does happen. Do it enough times and you are in the market for a new circuit breaker. Next time you cook something in your microwave feel the cord, it gets warm too.
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