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

    Aug 17, 2004
    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

    Jan 6, 2010
    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.
  3. Sponsor

    Sponsor Paid Advertisement

Similar Threads: Water pressure
Forum Title Date
Plumbing Forum, Professional & DIY Advice Water pressure issue in KY cabin Monday at 10:13 AM
Plumbing Forum, Professional & DIY Advice High pressure spikes in domestic water. Nov 6, 2017
Plumbing Forum, Professional & DIY Advice Master shower water pressure drop Nov 2, 2017
Plumbing Forum, Professional & DIY Advice Water pressure issue Oct 19, 2017
Plumbing Forum, Professional & DIY Advice Stagnant Water in Branch Pipe Going to the Pressure Tank? Oct 12, 2017

Share This Page