Hot water comes out once toilet is flushed
Alex here (some reason I'm locked out of the original account). It happen to be the 1 of my shower's valves. I noticed that the hot and cold water inlets were connected to the valve's sides labeled "shower" and "tub". I had to detach and weld the valve back to where the "shower" points up and "tub" points down. I also replaced the plastic cartridge where the shower handle would be placed just in case. With that, I now get hot water 24/7 without having to flush a toilet beforehand. Thank you all for the help!