Low hot water pressure at only one faucet
When low hot water pressure affects just a single faucet while the rest of the house has normal flow, the issue is isolated to that specific fixture rather than the water heater. It is typically caused by a clogged aerator, a partially closed supply valve, or a blocked cartridge under that specific handle.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Disconnecting the hot side supply line and spraying it into a bucket to test pressure
- 2Turning off the angle stop and inspecting the supply line for clogs
- 3Checking or replacing the faucet cartridge and angle stop seals
- 4Hiring a plumber
- 5Unhooking and cleaning out the pipes, and checking inside the faucet for clogs
- 6Replace the tap aerator
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“This only affects one faucet. The rest of the plumbing has the same pressure for hot and cold.”source ↗
“This only affects one faucet. Would that still be a water heater issue?”source ↗
“It worked for a few days, but now it’s back to doing this again.”source ↗
“I’ve been away for the summer and come back home to find that my upstairs bathroom tap has low water pressure.”source ↗
“I have checked all the other taps and showers in the house and they are all working normally.”source ↗
“I have tried hot and cold and the tap has low pressure on both.”source ↗
Where this came up
People with this problem also raised
- 3Why is there no water pressure after changing a faucet?
- 5Why is only one tap losing hot water?
- 2Why does my hot water stop when the sprinklers run?
- 2Why is my apartment shower too hot and low pressure?
- 7Kitchen faucet won't turn off after water outage
- 3Why are my cold taps running tepid after a water heater service?