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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 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 2/14/23 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 9:13 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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