Waterheater making noise last night. Cut the valve and power. Investigated this morning, found a leak in a coupler on the hot water side (high pressure). Went by home depot after work, grabbed a 3/4 inch sharkbite connector. Came home, removed the faulty coupler, installed the new shiny sharkbite. Took a few minutes, cost $7. It'd have cost 20 times that just to get a plumber to come out here. Yay for learning to fix things.