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My tankless powerstar hot water heater runs hot water nonstop no open spigot

Posted by John Renfrow on


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  • Water Master
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Posted on May 20, 2020


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SOURCE: powerstar bosch tankless water heater ae3.4

Yes the device is faulty. the unit should not heat water unless a tap is turned on. Call in a service rep to assess the problem. Do it quickly your description doesn't sound good.

Please rate this response and Good Luck Phil

Posted on Jan 02, 2009



  • 37 Answers

SOURCE: i have the bosch

how is heating element ? Wasit on with no water running thru it. Does it have a reset?

Posted on Jan 26, 2011


  • 33 Answers

SOURCE: We have a powerstar 125

try bleeding that section of pipe. or the whole system if not.

Posted on Jan 30, 2011


D. Floyd Kolb

  • 43501 Answers

SOURCE: Noritz tankless gas water heater.

The unit is plugged up with mineral buildup from the water going through it... it will need to be cleaned internally....this is done by running an acid solution through it to clean out the mineral buildup...

Then it will work again...


Posted on Feb 03, 2011


  • 1 Answer

SOURCE: PowerStar. Model 45-557701

Hot Water Hot to Cold And back. I had that problem for 2 years. I had a very large shower head from the time I installed the tank-less hot water heater and the water temp would change from one extreme to another. Over time my shower head had stopped working as well as it did so I bought a smaller shower head and installed it and amazingly my water temperature quit changing temperature. I now turn my water to what temp I want and it stays there. It's been working correctly for 6 months now ... until yesterday and it quit working completely which is the reason I'm on here. lol

Posted on Jun 30, 2012

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