I was not aware of any residential service having 3-phase supply.Yes, delta transformers used in residential
also if you have low voltage at times, hard to be around 24/7, issues too
I don't know your whole wire circuit to garage but if you have heavy load on circuits in garage may lower voltage and cause issues
I was only referring to some homes that may suffer from lower voltages.
No voltage drop issues in the garage and no large draws.
Aside from the heaters, it's all 120v load usage and nothing crazy. Not even a welder. Just your average power tools.
No reason for the garage to have not enough power