Hot water pressure is weak. Shower head isn't clogged. Cold water pressure is good. How do I increase the hot water pressure?

SOURCE: Shaking of the valve D500058BNT Parma Shower, not the pipes

The issue you have is known as water hammer per se. It is the result of water logged air chambers in instances such as yours. The easiest solution is to turn off the water supply to the house and drain the entire system from the lowest point available such as a hose bibb/water spigot. Turn off your electric water heater if applicable as lack of water will burn out the elements. Once this is done turn the water supply back on to the house and bleed the excess air out of each appliance by turning it on and running both hot and cold water until air dissipates. Another cause may be an inadequately secured plumbing system behind the shower itself. The piping should be secured to some cross member to prevent movement caused by water pressure. A special device is made in extreme circumstances and larger systems called a water hammer arrester which does the same job as an air chamber but uses different principles to accomplish the task. I hope this is of assistance to you and thanks for using Fix Ya. If I can be of further assistance please let me know.

SOURCE: Danze pressure balance single handle shower faucet

it the valve is full of dirt or needs to replaced not all the time but i have fix many buy just cleaning it out or pipes are fasten down. try just cleaning.

mstrmstr

• 60 Answers
• Posted on Dec 29, 2010

SOURCE: I have Danze, single handle

Replace valve canister- no construction- just remove after taking time to shut off water- a few screws and the job takes 15 minutes. I take for granted you have good water hot/cold to the fixture. This fix will cure most temperature balance problems.
The single lever system is a EZ care system. Note the canister can malfunction faster when exposed to untreated hard water.