I have an problem with ver low flow at a bathroom most distant from my hot water heater. The hot water is barely flowing in the shower and the sink. In fact, I feel like most of my facility is suffering from low flow except possibly the urinal. I put a gauge on the shower head, it reads 38 psi. I also put a gauge in the 3/4" supply line to the (new) hot water heater - it too reads 38-40 psi. I then put a gauge on line right after the water meter which is as close as I can get to the street. With no water flowing, it reads a static 58psi. If I flush the toilet which is closest to the water meter, it drops to 48-50psi and stays there until the toilet stops running. Is 40 psi at the shower head normal? Is the 10 psi drop on the main from one toilet flush indicative of a FLOW problem rather than a PRESSURE problem? I'm going to call the city and ask them to take a look at their valve but wonder what others think about this. The state code information I can find says that 40 psi should be OK but it sure seems low to me.