I need some advice on:

1. Pump size and a good manufacturer/model
2. Return pipe size and type of pipe (will pvc do OK?)
3. Is pipe insulation required

This is for a residential hot water recirculation system which has copper pipes.

I have 3 bathrooms, the farthest is about 70 feet from the Hot Water heater. I would like to run a recirculation system to save water and to get the hot water faster.

Any help/advice would be greatly appreciated.