low hot water pressure in bathroom sink only??

Question

I checked for a valve under the sink to see if it possibly wasn't open all the way but i did not see any valves. The cold water pressure is fine in the bathroom sink but hot water has been horrible since I moved in 7 months ago. Kitchen, and bathtub hot water pressure is just fine. The sink appeared to be newer if not brand new when I moved in. I live in the city, if that helps to know that I have city water and not well water. Please advise..I would love to be able to wash my hands with higher warm water pressure

Thanks in advance

under the sink there are 2 metal right angle, nipple type connections, with the rubber type tubing running up to the faucet at the top of the sink. I can get a picture of it to show what it looks like it if will help

Answer 1

You must have a shutoff valve under the sink. What does your hot water supply hose connect to?

In any event it seems to me that there may be an obstruction in the shutoff valve or in the faucet. Possibly it is the rubber seal in the valve. I don't think the aerator is plugged because the cold water pressure is fine.

Try disconnecting the end of the hot water supply hose that is at the faucet (after closing the shutoff valve) to see how much pressure you have in the hose. If the pressure is adequate, the problem must be in the faucet and you should disassemble the faucet's hot water valve. If the hose pressure is low, remove the other end of the hose and check the pressure directly at the shutoff valve. If the pressure is still low, you may have to shut down the water system so that you can remove the shutoff valve for cleaning.

I recall that a number of years ago there was a problem with some water heaters, whereby the constant heat would cause the plastic filler tube on the inside of the cold water inlet to disintegrate over time. I believe that the plastic broke up into particles that were circulated into the hot water pipes, plugging the valves. Since you only have this problem with one valve, it seems unlikely that this is your problem. Yet I would not rule it out without checking the possibility.

Answer 2

Low Hot Water Pressure

Answer 3

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RE:
low hot water pressure in bathroom sink only??
I checked for a valve under the sink to see if it possibly wasn't open all the way but i did not see any valves. The cold water pressure is fine in the bathroom sink but hot water has been horrible since I moved in 7 months ago. Kitchen, and bathtub hot water pressure is just fine. The sink...

Answer 4

Remove the aerator first, and clean the screen. Install a new faucet, or at least trace the line back to a place where you can remove it, or open it, and test the water pressure there. If it's good until then, you have a faucet problem.

Once in a while, I find a glass bead from the water heater thermal loss preventer that has blown through to the supply valve. It seats just inside of the supply valve, which you can't seem to find!

Answer 5

it's possible that the hot water has swollen the diaphragm in the hot water faucet and is restricting the flow. since you don't seem to have shut off valves you'll probably need to shut off the water to the whole house or at least at the hot water heater, if you have separate faucets. if you can find a brand name on your faucet you should be able to get a replacement cartridge for it before you start. or you can take the old one out and bring it with you, but also bring the brand name. if you have it repaired by a plumber, consider having him install shutoffs under the sink for the future. also, check the water temp setting on the water heater to see if it is set too high. so that the new cartridge will last, it should be set for 120 degrees. hope this helps, and good luck.

Answer 6

Sounds similar to a problem I had with my rented mobile home. Some skinflint had installed thin copper tubing, and it just wasn't big enough for any sensible volume. You need to trace the pipe -or tubing- and see how much needs to be replaced with a larger diameter. Then get all the necessary fittings so you can do the job once without having to run off for more parts. That's just one possibility, of course. It could be something totally different.

Answer 7

Hot water pipes build calcium deposits and chances are that either the pipes or the faucet or a hidden valve is/are blocked by deposits of calcium and therefore no water flow.

Answer 8

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close the hot water valve and reopen it

Answer 9

Really interesting question, looking forward to going through the answers

Answer 10

The first thing I would check is the valve, might be bad.second see if you have galvanized pipes, might need to be replaced.