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Got a new set of plans today so I changed to separate circuits of 10-2 each.
I will let you know if I ever get to know what I am installing.
~Peter
Thank you.

Caselec is 100% right, I think.
Have the plumber provide a cut sheet for the units and make sure the owner or general contractor and you each have a copy.

It's a common practice for the plumber to show up at the job and install something other than what was specified, often because it was in stock at his supplier's.

I've run 40 Amp Circuits to a few. They also come in 277 Volt models.
Just for that little square box.

Time for an update:
Yesterday I looked at the Panel schedules [which aren't on my copy] and they show 2000 warrs abd a 30 ano, 2 pole breaker. Thus the 10-2.
This morning I asked the super and he looked at the plumbers sheet and their plan is to use a 30 gallon cold water heater and feed all the sinks with that. This is design build, everything is co=ordinated.
The bad news for this thread is that we will never know exactly what was intended.
Thank you for your insights.
~Peter