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Hello my name is ***** ***** I look forward to helping you!
I am a Rinnai factory trained and certified installation and repair tech.
Are you new to tankless water heaters? Are you getting any error codes?
Do you know and understand what a cold water sandwich is?
Are you still there?
We are here to give advice. I have your answer, but I needed to know what it is that you know and what your expectations are.
Ok. You heater is doing its job. Just as it's supposed to. How it works has not been properly explained to you. This is common. Best of luck.
I am more than willing to explain it all to you, however your previous comment leads me to believe you are not wanting that. Let me know
All modern tankless water heaters have to prove it is safe to fire. Depending on brand this process takes about 8 seconds. During this 8 seconds cold water is running through the system. It checks fan speed, makes sure the exhaust can get out, waits for proof of flame, etc. This happens every time it has to start. So if you run hot water at a sink and wait for it to get hot, and then you shut it off and jump into the shower. You will feel the hot water already in the line and then the 8 seconds of cold water sandwiched between the hot water from you turning on the shower. If the heater itself was failing then it would give an error code. Usually a flame loss code or a blockage of venting. You are not getting any of that, so it leads me to believe its just a cold water sandwich
Did I explain that well enough? Feel free to ask for clarification.
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You you'd like under another question I can explain how to get rid of the cold water sandwich
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