Same problem, two baths. One shower, one bathtub. Before a relatively short shower, the water runs cold. Before the tub is half full, same problem, cold water.

Water heater is fine. Set the anti-scald thing to max on the Moen faucets.

Moen posi-temp models L82338/9. They are less than a year old.

HELP! It's frustrating to ask any guests to take a two minute shower or only fill the tub a quarter full.