It starts with a cold shower. Then, a trip to the big box store where you see a new water heater for $600. You do the math: "If I hire a plumber, this might cost $1,500. If I watch a YouTube video, I can do it myself and save $900." Stop right there. We are all for saving money and learning new skills, but replacing a water heater is not  the same as assembling an IKEA bookshelf. It sits at the dangerous intersection of Gas, Water, Carbon Monoxide, and High Pressure. Before y