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We've been experience low hot water pressure for quite a while. All hot water in the house has low water pressure. I have purged the hot water heater, but the problem persists. Any ideas??
What kind of pipes do you have? How old are they?
Please don't confuse low pressure with low flow rate. You can have high pressure (usually measured static in PSI) and still have low flow rate (measured in GPM)
You can only get out of something what you put into it. Do you have full flow on the inlet, equal to what the other cold lines have? If that's good then you apply the same principle in checking each step down the line till you find the restriction. Once found, the fix is usually obvious.
If there are galvanized steel pipes anywhere in the system that's the likely problem as they rust from the inside out and slowly clog up over time. The only solution for that is to get rid of it and replace it with something better. Many re-plumbed houses still have galvanized going to the meter past the house, and rust particles from there will continue to clog things downstream. Since the homeowner doesn't see the galvanized they think they're ok.
We need to know more details to analyze this at a distance.
Yes, we need to know more details, as mentioned above.
But in the meantime, look at the hot outlet on top of the water heater: check the nipple on the hot side, check the flex leading to the hot line in the wall. If you find a blockage (such as rust or mineral build up) - it's probably time to call a plumber.