Low water pressure in the home can be the result of a few different problems.
First, verify that the main valve and regulator (usually located outside the home where the main shut off is located) is in good working order and not corroded.
Secondly, check the aerator(s), located at the end of each faucet or tap. You may have to remove the tip and clean out the little screen ‘thing’ and then replace it to see if there is any difference.
Third, check under the sinks for corroded valve stops or bad supply lines.
Fourth, sometimes the problem could be at the water heater. You will need to check the supply lines and nipples (short, little pipes), normally two, one coming into the water heater, cold water, and one going out into the home, supplying the hot water.
Today we will discuss low hot water pressure to all the faucets or taps in the home.
Before you take any pipes apart, make sure to shut off any valves to the area you are working on. If there is not any shut off valves under the sinks or at the water heater you will have to turn off the main valve to the home.
Chasing a low water pressure issue in the home can prove to be a real challenge. This job made it a little easier (not really…) by being on the hot water side only.
Having determined that the issue was only on the hot side of all the faucets, tells me that this problem is at the water heater. If the pressure would have been throughout the house at all the faucets, hot and cold water, it would have been a different problem.
Cleaning or changing out supply lines is the first and probably the only thing you have to do. Depending on where your shut offs are located, accessing the piping can be the difficult thing. Allow some time to do this and the outcome will be in your favor. Also, make sure you have a variety of tools and materials to do this kind of work. Good luck with this, I hope it helped