I want to place a 240V electric base board heater in a room. In the adjacent room I have a conveniently placed electric wall oven by itself on a 50 Amp circuit with 8 gauge wire. The oven is only rated at 30 Amps and the heater at 4.5 amps. So, I want to run wire from the oven to where the heater is going to be (a very short distance). Running a new circuit from the heater to the box would be very long and involve a tremendous amount on drywall work, time and money (in which case I would abandon my plan for a heater).

So, here are my questions/concerns:
I would normally run 12/2 to the heater if it were on it's own circuit, but since it is on a 50 amp breaker, should I run 8 gauge the short distance to the heater location? OR could I run 12/2 without concern?

Or, should I place an inline 20 amp breaker at the oven location and run 12/2 to the heater?

The oven has a white nuetral wire because it also runs a 120V clock, etc. but the heater is straight 240V. Can I just ignore the nuetral?

What other problems/concerns am I obviously overlooking?

Thanks for all your expert time and advice.

What you are proposing is a bit unorthodox, but, I can understand why. As long as you use a 20 amp circuit breaker or fuse at the oven, then run #12 from this breaker/fuse to the heater,the heater will be protected properly.

Since the new heater is straight 240 volt, you do not need to connect anything to the neutral at the oven.

I do suggest that you install a separate circuit for the heater in the future once you can. But otherwise this method will work and is safe.

Thanks.
Do they sell small subpanels for one breaker?
Thanks. Jesse

Yes theysell 2 circuit panels , for two 1 pole circuit breakers.