I didn't do much research beforehand. I just bought a water heater and they came to install it. Since then, the worker has had to fix it 3 or 4 times. The first couple times, he just came to mess with the water heater's settings. Recently, they just brought and installed a totally new heater. Also, they pointed fingers at me saying that I had to pay to change the crossover with a plumber, but that didn't even fix the problem.
more