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  1. Obsoperator

    hose bib sounds like a jack hammer

    My own diagnosis is that the backflow preventor (white nylon, plus some O-rings and a washer) is not the source of the noise. There is no discharge from the backflow preventor during the noise. Now that I have opened up the American valve (from HD or Lowes, don't remember) I can see that the...
  2. Obsoperator

    Cold usage pulls hot water lines?

    Well, +$150 price alone, if not the adjustable thermostat with a plastic knob. And the diagram indicates that it has check valves built into it. I really meant "high-end" in comparison to the old-style, steam-whistle shaped Watts tempering valve I bought for my toilet tanks years ago. I...
  3. Obsoperator

    Cold usage pulls hot water lines?

    Cold water flow into hot pipes Thanks for your comment hj. I was trying to raise the possiblity (?) that the check valves are limed up in the high-end Watts tempering valve, and that cold water usage is pulling hot water backwards through the water heater. That hot water would be replaced by...
  4. Obsoperator

    Cold usage pulls hot water lines?

    I live in a large 1955 ranch house with a 50' insulated 1/2" copper horizontal run from the water heater to the kitchen. The 3/4" copper cold water runs 50' from the service valve to the water heater. When I run a lawn sprinkler from a hose, it seems like even a recently used hot water faucet...
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