PVC is PVC.... you don't need the type of PVC that will carry hot water. It is called cpvc. You can tell the difference by the color of the pipe. PVC is white, cpvc is cream color. The cpvc also has a smaller size than pvc. It is okay to use cpvc if you want to. It is just a little more expensive than pvc. The 1/2 inch size is very good to hook up returns for smaller tanks. By all means, buy it at HD.
Sonny