Electrical breaker question

[Shaela21]

I have 2-15 amp breakers that are ganged together by a metal clip. They supplied power to a baseboard heater using 3 wires. The white wire came from one breaker, the black wire came from the other breaker, and the ground was connected to the box, which is fine. I have removed the baseboard heater and am not going to replace it. I want to route this wiring to my shop to supply 110 volt, 15 amp power. Am I correct in removing the white wire from the breaker and connecting it to common neutral bus bar, and I would be using the breaker with the black wire as my 15 amp breaker to the shop?

With the 2 breakers ganged together in this fashion, would there be 30 amps being sent to the old baseboard heater, and would it also be 220 volts? I am just trying to understand why it was done this way. The two 15 amp breakers are two independent breakers used together. Is this a common thing?

Thanks for the assistance.

[HayZee518]

two single pole breakers with the "tie bar" were used to supply your heater. If the contractor couldn't find a 15 amp 240 breaker with a common trip, then this is a correct procedure. removing the clip or tie bar will give you two single pole breakers for you do with whatever you want. you will be feeding 120 volts at 15 amps to the circuit(s). Parallelling two breakers will not produce 30 amps just 15 amp @ 240 volts.