Water pressure fluctuates in shower, just one side

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Terry, Apr 2, 2012.

  1. Terry

    Terry Administrator Staff Member

    Bothell, Washington
    I've had a few customers with water pressure that fluctuates in the shower, just one side. Sometimes you have a pressure drop off if someone is using other plumbing that drops the flow for a moment, maybe a toilet being flushed, a washer cycling on, or someone at the kitchen sink.
    Sometimes it gets stranger though. Sometimes the problem faucet is the only fixture being used, and it has a maddening little quirk about it. Pressure may flutter or fluctuate for no good reason. One time on Mercer Island I found a round plastic ball in the cold water side. I removed the shower valve and there it was. It was most likely a ball from the heat trap nipples of the water heater that had flowed downstream.

    This week, a customer in Bellevue had the problem on the hot side. Plenty of crud had been accumulating in the aerators of the faucets, and the water heater was running out of heated water sooner and sooner. The eight year old Water heater was behind the tub in question, so we pulled and replaced the water heater, and installed a new Moen Posi-Temp tub shower valve with new trim. The old Moen valve, when removed had junk in the hot side pipe. The picture below shows the broken bits from the old dip tube.

  2. Hackney plumbing

    Hackney plumbing Homeowner

    I removed the heat traps and the plastic diptube from my water heater when I installed it. I made a copper diptube and made it longer than the factory one.

    Nice post Terry. Good info for those who do not do alot of repair.
Similar Threads: Water pressure
Forum Title Date
Plumbing Forum, Professional & DIY Advice Low water pressure except after running hot water Yesterday at 9:00 AM
Plumbing Forum, Professional & DIY Advice Expansion Tank & System Pressure After New Water Heater (Rising Pressure) Friday at 4:01 PM
Plumbing Forum, Professional & DIY Advice Regulating outside hose/water supply pressure Dec 8, 2014
Plumbing Forum, Professional & DIY Advice Pressure on my water well is at 17 and sucks air after about 10 minutes. Dec 2, 2014
Plumbing Forum, Professional & DIY Advice navien combo 240 water pressure Nov 20, 2014

Share This Page