IMHO, I would also add a timer to turn on your system just before you typically take your shower, otherwise I am GUESSING you will be wasting a lot of energy. On a side note, I turn on the shower to full HOT, wait 30 seconds, move the shower handle to a known comfortable heat setting, and 4 seconds later shower is ready.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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