"tried draining"????? What you describe sounds like a lot of debris, calcium buildup in the tank. If you tried to drain but nothing came out, that is the problem. With the drain valve full open, run a coat hanger or similar up the drain to break up deposits. Careful, that is hot water, might be best to shut off the power and let it cool or run the hot water out. Once you have water flowing from the drain, let it run until it is nearly clear, Repeat in a week or so, and every 6 mo.