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Water heater.
The heat traps are plastic devices that are in the ends of the in/outs of the heater as -purchased. I suspect them to be the items responsible for this noise. The heater is electric and is brand new, but not using electric as it's run off a heat exchanger from the outside boiler. It will clack even when a location in another part of the house is used and also clacks when the well pump cycles. I'm about ready to take that heater apart and rip those heat traps out!!
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