When having a new water heater installed there are a few questions that you should ask the plumbing company prior to installation. Is the technician installing the water heater licensed? Mistakes can be costly, by using a state licensed professional you know the installation will be done correctly. If you are within the city limits, inquire if they are going to pull a city permit. It is also important to know what you are buying. Ask them what brand of water heater they are planning on installing? Lastly, what are they planning on doing with the old water heater? Are they taking it with them?