Had a similar prob with the CA house a few years back, once good and hot the flow slowed to a trickle. Found the screen filter clogging up with white crud. Talked to a neighbor and found he had the same problem, but it was repaired under a builder's recall. Too far out of date for mine, but got enough info to determine the cause. In my case the dip tube in the water heater was of faulty PVC, which deteriorated over time. Only recourse for me was to replace the water tank. Once replaced the hot water flow returned to normal and remains steady to date.

The tank was chock full of deteriorated PVC, basically the same scenario as one filled with sediment.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.