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Tankless water heater / shower control
Posted on 2/28/25 at 8:45 pm
Posted on 2/28/25 at 8:45 pm
Two days ago, I descaled my Noritz tankless water heater, which was a fairly simple process after watching a few YouTube videos. I have the water temperature set to 125°F (it can go up to 130°F).
When I use faucets with separate hot and cold controls, the water consistently stays at 125°F. However, when using the shower (which has a combined hot and cold control), the temperature is usually below 125°F, but that’s not the main issue.
The real problem is that sometimes I get cold water, with almost no hot water, for several minutes at a time. Has anyone experienced something similar, or does anyone have any suggestions on what could be causing this?
I’m considering replacing my shower control and/or head, as it’s over 16 years old. Do these controls wear out over time and potentially cause issues like this?
When I use faucets with separate hot and cold controls, the water consistently stays at 125°F. However, when using the shower (which has a combined hot and cold control), the temperature is usually below 125°F, but that’s not the main issue.
The real problem is that sometimes I get cold water, with almost no hot water, for several minutes at a time. Has anyone experienced something similar, or does anyone have any suggestions on what could be causing this?
I’m considering replacing my shower control and/or head, as it’s over 16 years old. Do these controls wear out over time and potentially cause issues like this?
This post was edited on 2/28/25 at 8:48 pm
6
Posted on 2/28/25 at 9:20 pm to Will Cover
I have the same issue and am curious for the answer.
Posted on 2/28/25 at 9:30 pm to Will Cover
I had this issue with my kids shower. I believe it’s a demand issue. The water heater is tasked with producing hot water and when it’s fulfilled it cycles off until it’s needed again. What I did is drilled out the shower head restrictor and allowed a larger volume of water to flow so it no longer cycles the water heater on and off.
Posted on 2/28/25 at 9:50 pm to Will Cover
So the water will be flowing hot and the wham....cold water? If my wife decides to do dishes then yes, but otherwise no.
Posted on 2/28/25 at 11:49 pm to Zappas Stache
I would like it hotter, but I understand that because the way the controls are “mixed” with hot and cold running at the same time, it’s not possible adjust the temperature of the water myself as if I had a separate hot and cold knob.
To answer your question, yes, it will be warm - not as warm as I would like - and then it will go cold for a good period of time. Note, this does not happen on my sinks where I have separate controls. Only on my shower, which leads me to believe there is an issue with my shower control and/or head.
To answer your question, yes, it will be warm - not as warm as I would like - and then it will go cold for a good period of time. Note, this does not happen on my sinks where I have separate controls. Only on my shower, which leads me to believe there is an issue with my shower control and/or head.
This post was edited on 2/28/25 at 11:53 pm
Posted on 3/1/25 at 1:41 am to Will Cover
I had a similar on both of my showers with cartridge valves, except mine would cycle off every few seconds, reignite after about a second, over and over again. Kitchen sink didn’t have this problem. I changed the cartridges in both showers and the issue has almost disappeared. The issue was that my unit has a minimum ignition flow of .4 gpm, and I take barely warm showers, so the demand for hot water was teetering on that minimum threshold. I assume the older cartridges were a little less than steady and would dip below the min back and forth enough to cause the unit to shut off and reignite. This issue didn’t happen if I turned the water hotter. Good luck.
Posted on 3/1/25 at 7:46 am to Will Cover
If you take the handle off, you should have an adjustment for how much hot is allowed when fully turned. I'm guessing the issue is the shower isn't pulling the minimum to keep the tankless on and heating.
Posted on 3/1/25 at 9:04 am to Will Cover
Had this issue and plumber came by and removed my shower head and cleaned it out - it had some trash in it restricting the flow - once he put it back on it worked flawlessly- cheap and easy fix to try before you go down a rabbit hole
Posted on 3/1/25 at 10:09 am to bamaswallows
quote:
Had this issue and plumber came by and removed my shower head and cleaned it out - it had some trash in it restricting the flow - once he put it back on it worked flawlessly- cheap and easy fix to try before you go down a rabbit hole
I just did this, and it fixed my issue. Didn’t even think that the low pressure would be the cause of the heater not kicking on. Perfect sense though.
Posted on 3/1/25 at 1:40 pm to Will Cover
As others have noted, removing the restrictor in the shower head should do the trick. I had the same issue, removed the restrictor, turned the water heater all that way up and havent had an issue since. As someone else noted I think it is a demand issue where it shuts off the water heater if there isnt enough flow.
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