You can use both power sources circuit to heat a room, but it must comply with the voltage assigned to the heating cables that are to be connected to the chosen power source circuit.
Here in Canada, it is mainly a 240 Vac power source to which are connected the electrical elements for heating a room. By cons, there are situations where the only power source available is 120 Vac (Ex: an old residence, an inlet electrical box with only available 120 Vac circuits breaker and in some West states of the United States, where the only power source available is of 120 Vac).
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