Originally Posted by papajess
Can you move your neutral on that outlet to another breaker? If you can u now have 240.
In principle, this can work, but you need to verify a couple things to do it safely when adding a breaker and powering the white as a second hot leg.
1) If there is more than one outlet on the circuit, and you rewire just one for 240 V, you run the risk of frying any 120 volt equipment plugged in elsewhere.
2) The wire gauge between the breakers and the receptacle will determine the maximum wattage of the element you can use.
If its 14 gauge like most home receptacles, it is limited to 15 amps of current. 240 V x 15 A = 3600 watts
If its 12 gauge like some home receptacles, it is limited to 20 amps of
current. 240 V x 20 A = 4800 watts.
3) Regardless of the voltage, 120, 240, or whatever, the wire size determines max. current. The circuit breaker has to be sized to the wire size, because the breaker protects the wire from an over-current condition.