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re: Weird plumbing issue in brand new house with tankless water heater

Posted on 2/13/23 at 9:34 pm to
Posted by Handsome Pete
Member since Apr 2019
1332 posts
Posted on 2/13/23 at 9:34 pm to
quote:

New house ...... Youve got trash in your lines


How would that affect the hot water? Literally sometimes the water will be lukewarm and stay that way until I turn it off then right back on. Then it's steaming hot. I thought this might be a quirk of tankless water heaters.
Posted by tigers win2
Baton Rouge
Member since Oct 2009
3840 posts
Posted on 2/13/23 at 11:00 pm to
quote:

Literally sometimes the water will be lukewarm and stay that way until I turn it off then right back on. Then it's steaming hot. I thought this might be a quirk of tankless water heaters.


The tankless heater fires up when it detects water movement/ flow. I have two of them and sometimes during very cold outside temperatures mine do what you’re describing. If i open and close the faucet once or twice, it picks up the flow and water gets appropriately hot. Doesn’t usually happen unless temperatures are in low thirties or below. My tankless units are in the attic.

I’ve replaced one and both the older unit (10 years) and newer unit (2 years) have done it at times.
Posted by omegaman66
greenwell springs
Member since Oct 2007
22786 posts
Posted on 2/14/23 at 12:28 am to
quote:

How would that affect the hot water? Literally sometimes the water will be lukewarm and stay that way until I turn it off then right back on. Then it's steaming hot. I thought this might be a quirk of tankless water heaters.


If your heater is electric then it could be a bad breaker. My heater has two breakers. One was bad but the other was not. So at times we would get hot and sometimes just warm. Changed breaker and that fixed that issue.
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