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I have used a “point of use” heater in the kitchen... It’s about one gallon and sits right below the kitchen sink... The “cold” water in actually comes from the hot-water line of the house.

I think you just resolved one of the greatest annoyances about my new house. I timed it: running full hot water from the kitchen faucet it takes 1:15 before it gets hot. Part of that is the distance, and some the diameter of the pipes, but I believe most of it is the slow "water saver" flow of the faucet. I will have to measure the actual flow. If it flows at the most common limit of 2.2 gallons per minute the 1.5 gallon unit you have would run out before the other hot water arrived. But I suspect the flow is slower than that.

There is already power under the sink for the garbage disposal, which came with the house. Such a device is contraindicated when it runs to a septic tank and leaching field buried in the yard. I'm sure the plumber can get rid of that while he is under there.
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