We live in an old house with cast iron plumbing. We used to have a problem of the water taking forever to get warm in certain parts of the house, so we installed a tankless. Now, when someone runs hot water while another person is showering, the showering person gets frozen, but also, if someone runs cold water while another person is in the shower, the showering person gets scalded. Also, if I change the pressure setting on the shower head, it seems to trigger the water to go haywire and go scalding hot. And it does it at other times seemingly at random. It will be scalding hot until I turn it all the way to the coldest setting, then I have to inch it back to get it to a normal temperature again. It sucks when I'm trying to bathe my kids! All we currently have is a shower stall, the pipes under the tub need to be replaced. It all needs to be replaced, but we can't afford it. Anyway, I was just wondering if anyone here could help me piece together what is happening with the water. We recently replaced the shower knob cartridge but it didn't change anything. Thanks!
It sounds like you are experiencing some unusual behavior with your tankless water heater. There could be a few different factors contributing to these issues.
One possibility is that the temperature sensing and control system on your tankless water heater is not working properly. This could be caused by a problem with the thermostat or other components of the temperature control system.
Another possibility is that there is an issue with the flow rate of the hot water being delivered to your shower. If the flow rate is too low, the water may not have enough time to heat up properly, resulting in cold water being mixed with hot water.
It's also possible that there is a problem with the plumbing in your house, such as a blockage or a leak, which is causing the water temperature to fluctuate.
To troubleshoot these issues, you may want to start by checking the thermostat and control system on your tankless water heater to make sure it is functioning properly. If the thermostat appears to be working correctly, you may want to try adjusting the flow rate of the hot water to see if that helps stabilize the water temperature. If these steps do not resolve the problem, it may be necessary to call a plumber to diagnose and fix the issue.
I hope this helps! If you have any further questions, don't hesitate to ask.
Posted on Dec 27, 2022
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