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Weird plumbing issue in brand new house with tankless water heater
Posted on 2/13/23 at 4:15 pm
Posted on 2/13/23 at 4:15 pm
Moved into my new house, new construction, with a tankless water heater. We have the water heat setting maxed out at 140 degrees. Often when we first start a shower or faucet, it doesn't get too hot and water pressure is low, no matter how long it runs. If we turn it off, then back on immediately it gets hot and water pressure improves. Sometimes have to turn off and on a couple times. Any ideas? Faucet issue or water heater issue?
8
Posted on 2/13/23 at 4:20 pm to Handsome Pete
Are you in a well? Had a similar issue and had to crank up the psi on our well tank. Issue with hot water was not enough flow to kickoff the on demand heater.
Posted on 2/13/23 at 4:35 pm to Handsome Pete
Where you located?
Also make sure all valves are wide open.
Also make sure all valves are wide open.
This post was edited on 2/13/23 at 4:36 pm
Posted on 2/13/23 at 4:49 pm to Handsome Pete
Maybe there's some air in the line somewhere restricting flow. That is weird.
Posted on 2/13/23 at 7:49 pm to poochie
I agree that there may be an air pocket in the heater. Is there a high point bleed on it to check the water outlet?
Posted on 2/13/23 at 8:13 pm to Handsome Pete
quote:
Moved into my new house, new construction, with a tankless water heater.
Have you checked your panel by the unit? They have corresponding number codes that will blink depending on the error.
Posted on 2/13/23 at 9:11 pm to Saskwatch
New house ......
Youve got trash in your lines
Remove and clean all faucet filters
Youve got trash in your lines
Remove and clean all faucet filters
Posted on 2/13/23 at 9:31 pm to way_south
quote:
Are you in a well?
Not a well. I'm in Baton Rouge in city water.
Posted on 2/13/23 at 9:32 pm to Saskwatch
quote:
Have you checked your panel by the unit?
Unit looks good, no error message or alerts.
Posted on 2/13/23 at 9:34 pm to Drop4Loss
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 on 2/13/23 at 11:00 pm to Handsome Pete
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 on 2/14/23 at 12:28 am to Handsome Pete
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.
Posted on 2/14/23 at 1:34 am to Handsome Pete
Might try opening all hot water faucets. If any restrictions, that would move it. Make sure all faucets are cleaned, the strainer part. Also for the shower head, remove the orifice.
I just had one installed for a friend, the tankless. The plumber I use knows more about those things. I you can’t get it to working properly, let me know.
I just had one installed for a friend, the tankless. The plumber I use knows more about those things. I you can’t get it to working properly, let me know.
This post was edited on 2/14/23 at 1:39 am
Posted on 2/14/23 at 6:11 am to tigers win2
quote:
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.
This is kind of what I thought might be going on. And mine was installed outside on an exterior wall of the house, so maybe it's an external temp thing.
Posted on 2/14/23 at 6:54 am to Handsome Pete
As said I’d take the head off the shower head and make sure there’s no screen that has a blockage, and run the shower with the head off to clear the line.
It’s possible your valve is loose or bad and not catching every time? Thereby not letting enough water out?
If that doesn’t solve it I’d consider asking the water heater company.
It’s possible your valve is loose or bad and not catching every time? Thereby not letting enough water out?
If that doesn’t solve it I’d consider asking the water heater company.
Posted on 2/14/23 at 8:50 am to Handsome Pete
We had similar issues with ours when we moved into our new construction. Ended up having sawdust and other junk in the lines. Plumber cleaned it out and it's worked fine ever since.
Posted on 2/14/23 at 9:09 am to Drop4Loss
quote:
Remove and clean all faucet filters
It's amazing how well that works
Posted on 2/14/23 at 9:13 am to Handsome Pete
What kind of tankless unit is it?
Posted on 2/14/23 at 10:29 am to Handsome Pete
quote:
Often when we first start a shower or faucet, it doesn't get too hot and water pressure is low, no matter how long it runs.
Is this every shower and faucet in the house? If it's just one or two, you may have junk in the hot water lines leading to a particular room or maybe the heater itself if it's everything. I had a similar issue in a guest bathroom. It had a faucet that had something caught in it that restricted flow to the faucet where it combined the hot and cold water. Once we cleaned it, no issues.
Posted on 2/15/23 at 8:11 pm to Handsome Pete
140F setpoint could be too high… seems counterintuitive, but if u lower the set temp, you’ll be flowing more hot water to the shower head than you would have with the higher SP. This will ensure you have enough flow to keep the tankless kicked on.
When this happens is your shower set on max hot or what % to full hot?
You can also try and run another hot water tub faucet (to ensure you have enough flow demand to make the water heater kick on).
When this happens is your shower set on max hot or what % to full hot?
You can also try and run another hot water tub faucet (to ensure you have enough flow demand to make the water heater kick on).
This post was edited on 2/15/23 at 8:13 pm
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