Coming from Maine energy has always been an awareness for us so I picked up on this our 1st week here. It is not an energy efficient design and I don't believe there is much for insulation between water heater and fixtures. So while you are waiting at sink or shower for water to heat up to a useable temperature all that water running while you wait was at water heater temp at one time. Energy loss to ground and slab is high. "Loop" will certainly cut wait time but I'm struggling to understand how it would save BTU's. Maybe the earlier post might explain how the loop works. Fortunately energy cost much lower in Florida but still a waste.
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