Heaters can use up to 1500 watts and 12.5 Amps on the highest setting. The average home uses 15 Amp circuit breakers, which only allows 2.5 additional amps to be used before the maximum limit is reached. If you have other appliances such as a refrigerator, microwave, TV, etc. plugged in to the same outlet or on the same circuit then you may have surpassed the maximum amount of wattage that can be used on that circuit. Some homes may even have several rooms on the same circuit breaker. Note: A circuit breaker can be tripped either right after you turn your heater on or after it has been running for a while.