Placing the water heater near the front of the garage is largely responsible for the unecessary loss. Placing it near the kitchen or master bath would help efficacy.
Fyi; For my Iris, temperature drop from the on demand heater to the bathroom is about 10 degrees so recirculating will waste energy reheating the under ground lines
I've measured less that two gallons of water run before it is warm at the master shower. About right for brushing teeth.
Since we reclaim waste water, It's not completely wasted. I have no idea how efficient that system is.
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