When I install a Moen valve, it has a reducer built into the valve that forces most of the water downward. Even with that, If a smaller pipe like PEX and PEX fittings are used on the tub spout it will force water out of the shower head.
Make your plumber sign a paper stating that if his way doesn't work, since it's not the way the Hansgrohe instructions show, that he will come out and open the wall up to make the changes when it fails you.
I install those valves all the time. I would have never done it his way. No way!
Make your plumber sign a paper stating that if his way doesn't work, since it's not the way the Hansgrohe instructions show, that he will come out and open the wall up to make the changes when it fails you.
I install those valves all the time. I would have never done it his way. No way!