I mentioned the back of my truck is a bit messy from this weekend job in a different post. So I figured I share a picture of the final result. Sorry I was not smart enough to take a before picture.
The heater is installed on the first floor, in a kitchen in a grocery store. There is RPZ's on the main water service which makes it a closed system. The Illinois plumbing code states an expansion tank is necessary on a closed system. The Vacuum relief valve is required if the water heater is higher than any fixture. Also we toss the pressure relief valve and have to install a T&P valve.