I have a 20 amp breaker that is providing juice to the new outlets I installed in my basement. I would like to put a space heater in the three rooms. The space heater allows for (1000/1500/1600W, 120/208/240V) but I am concerned that 1000/120v will not be enough. Will I have to run separate wire for 240 or can I change out the circuit breaker with a 220? Will that impact what I can use with all of the outlets that are currently wired to the 20 amp breaker?