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Well, I feel silly, but I think our main valve is on top of our water heater in our basement. Does that sound like a likely place?

We seem to have adequate pressure in the rest of the house, but...

Maybe the tank somehow drains, but then doesn't fill when the bath or the shower is running, but there IS water in the bowl.

Scenario: Go in Bathroom, Turn on Shower. Use toilet. Go to Flush...