Okay, so you probably don’t spend all that much time thinking about your water heater. Yeah, it’s an important system, and you would really miss it if it stopped working, but most people don’t devote a lot of attention to it unless something is wrong with it. Still, if you’re looking for a new one you’d better be paying close attention to certain factors. Installing a water heater that doesn’t quite fit your needs has the potential to do quite a bit more harm than good.