Just wanted to add a note I ran the hot water for the better part of an hour but very little was coming out because it was clogged. Use your judgment, I was just trying to get it to where the water was not too hot when I open the valve so I don't get scolded. Once I shut the water off into the heater, however, there was no pressure built up at all; I put a tote under the valve to catch any water, but very little water came out.
