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No instant hot water

Recently my water pipes were ''hammering'' increasingly loudly and for longer periods of time (when the water was off). I searched on the Internet and drained the pipes as recommended. Now, I no longer have instant hot water at any of the faucets in my home.

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  • Don Doty Dec 30, 2008

    We have a tanked hot water heater with a Lain Termotech pump which up to this point, provided instant hot water at each faucet until I drained the pipes.

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If you have a tankless hot water heater, you may still need to install an expansion air chamber to stop the "water hammer"; If you have a tanked hot water heater, you will never get instant hot water like with a tankless unit.

Posted on Dec 30, 2008

  • Glenn Snow Dec 30, 2008

    OK, now I understand, you no longer have noise or instant hot water... so, we suspect the heating pump mechanism.. make sure it is powered and turned on, and if so, you must also make sure there is no locked air in the pump system. you must force water through it to bleed out the air, then you should be fixed, assuming to that there are no heating elements in the pump itself to burn out... good luck

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Install air chamber to cushion sudden-stop of flowing water.
Water flow coming to sudden stop is called water hammer, and will bang pipes, but also loosen plumbing joints, causing leaks.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#bang
http://waterheatertimer.org/images/Flow-rates-water-hammer-600.jpg

Air chamber has to be vertical, and about 18" long, with cap on top.
By code each Hot and Cold line at each tap will have air chamber located behind the wall. So there are two air chambers at each tap.

In your case, you can probably add air chamber to your Hot and Cold lines and solve problem for both dwellings.

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