PVC Hot Water Supply Pipe
I might be a little old-fashioned here, by making this
statement that I don't like to see PVC pipes coming off of the water
heater. I don't even know if you're allowed to use PVC pipes to supply
hot water throughout your home.
If you are going to use PVC water supply pipe for your home, make sure that it can take temperatures above 200°F. I don't know if you're even allowed to use PVC for the pressure relief valve.
I will look into it a little further in the future, so that you will have a little more information about this type of plumbing.