I had a new hot water heater installed and now the upstairs hot water pressure is very poor. Cold water pressure is fine. House is 8 years old. What can I do to fix this myself, if possible, anything simple?

I'm still experiencing low hot water pressure even after replacing the water heater. When you first turn on the faucets the pressure will be fine but within a few seconds it drops again.

My hot water starts with full pressure then quickly reduces flow to trickle at all household faucets. Already flushed water heater twice. Flow comes back temporarily once tank refills, then peters out again. No muck or discoloration in water. Cold water side has full pressure (even when Hot water...

I have very low water pressure from my hot water heater. I can't find anything wrong.. any ideas?

I just replaced an old electric hot water heater, roughly 10+ years old, with a new one. This was done in the early am, before noon. It is now evening, after 6pm EST. and I've noticed two things. 1) My hot water pressure is now low in all of my faucets, but the cold water is fine. 2) The water...