I recently installed a Bosch AquaStar 250SX on demand hot water heater. Since the installation, I've had problems with temperature cycling in the showers when someone else in the house is using water. The user manual suggests that unbalanced water pressure and the hot water heater restricting flow could be resulting in the hot water flow dropping below the .8 gal/min flow required to activate heating. Is there a water pressure balancing valve that would be appropriate to install immediately downstream from the hot water heater? If I do this, is it likely to solve the problem? By the way, the incoming water pressure to the house is 80 PSI, and I see 80 PSI far downstream on the cold water side. I don't have a place to measure the hot water side.