Plumbing Questions? Ask a Plumbing Expert.
excellent question .
This will not hurt the system at all. The worst case scenario is if the boiler wants water...and it cant get it...it will trip off on low water cut off.
I am not saying it is ideal, but in a pinch it will work. I would however, test low water cutoff each fall as part of the yearly service.
Yes, you are correct.