I am installing a 240v ductless mini split. My breaker box is full, and I have a seperate ( hot water ) breaker in its own box on its own meter. I see two ways I can approach the situation:
1) Add a subpanel on a breaker in the main box. Not preferred because I fear blowing the main breaker.
2) Upgrade the breaker in the hot water box to supply a new subpanel. Preferred because I wont have to be concerned with blowing the main breaker, BUT there is no shutoff between this breaker and the meter, so the meter has to be pulled.
Are there other plausable options that I am missing? Any other reasons why option 1 may be better than option 2?
Update: The main is a 100 amp Westinghouse, the house is 2000 sq ft. 4 beds 2 baths. The house is currently run on an oil furnace. + added images