I bought a small 1500 Watt portable blow heater for my room cuz it getting really cold, but whenever its turned on, it trips the circuit breaker.What exactly causes the circuit to break? I mean, what units should I concern myself with when buying a heater, --Watts or Voltage? Why does this heater trip circuit when other stuff (computers, lamps etc) doesn't? Also, what uses the most power, is it the fan turning or the heating element? What if I I bought two 700 Watt heaters --would that heat the room more with less power used? Thanks for any help.