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Old 01-31-2016, 09:08 PM   #1
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Help with electric tankless cold water sandwich


Hello
Please help me comprehend an unfrustrate me with a situation termed "cold water sandwich" (CWS).

In our msster bath is a valve from 2011 that either directs water to the regular showerhead or from overhead. We have an electric, tankless water heater of ample capacity.

My wife or daughter will shower using the regular showerhead and be fine. I will come in 2, 5, 10, 12, etc minutes later to shower, and I get hot water right away for about a minute or 2. I then get very cold water for a while until the hot returns.

I've done some research on the CWS, but it still baffles me as i wait for cold water with a head full of shampoo. How can pipes cool down here in Miamj where our temperatures are always hot. I can understand this occurring in Minnesota, Alaska, etc, but in Miami? I wasnt exagerating about the time gap between the showers. The same situation happens if we reverse the order of showering, with me going first.

Why does this happen? Is it preventable? With a recirc pump perhaps?
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Old 01-31-2016, 09:25 PM   #2
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My novice opinion. The tankless heat only turns on when water flows. If the unit has been off for while some cold water has to flow before the heat kicks back, thus you get some cold through the unit.
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Old 01-31-2016, 09:32 PM   #3
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Agree with joed. As far as is it preventable; Possibly, with a recirculating pump as you suggested. It makes sense.
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