If using threaded how do you control the angle the valve handle ends pointing?
Measure and cut two 3/4" copper pipe stubs and sweat them into 3/4" male threaded fittings. Let cool and install them into the ball valve with pipe dope and teflon tape. Wrap the ball valve with a wet rag and sweat the unit into the pipes for the water heater. I do the same thing for replacing the main shut off valve for the house.