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The hot water pressure in our 3rd floor shower is very low. The 2nd floor shower however, has very good pressure. The problem is not the shower head, which actually produces great pressure when turned onto cold.

I've also lived in other houses with 3rd floor showers where the pressure was fine. Could it be clogged? How could I clear a clog if there is one? Are there ways to optimize or boost the pressure?

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is this a new problem? Did problem exist before the Delta shower head was installed? If you remove the shower head, is the flow out of feeder pipe good? – shirlock homes Dec 19 '10 at 19:39

If the cold water pressure is good, then you are right about the shower head not being the problem.

Check the hot water shut off valve feeding the tub to assure it is opened fully.

Also if you have good hot water pressure at the vanity and are sure shut off valve is fully open, the problem may be in the mixing valve that feeds the shower head. It's not uncommon for deposits to form over a number of years in this valve and restrict flow, especially on the hot side. Could also be a broken or stuck washer in the mixer. You can shut off the water to the valve, hot and cold, remove and inspect the cartridge from the front. Remove the handle(s), the bezel trim and the valve cartridge should come out with a wrench. If any of the internal parts look suspect, take it to your hardware store and they can help you select new soft parts to rebuild it. Replace it in opposite order that you disassembled it, and don't forget to put some plumbers putty under the top and sides (not very bottom) of the bezel, so water won't leak in behind it and down your wall.

Good luck.

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