I'm turning off supply in a house that is new to me. I think that I'm
able to shut off the supply as it comes into the house. I opened some
faucets and let it drain and flushed a toilet, but it never came to null
in terms of flux.

These faucets sit gravitionally-equal to the center of the hot water
heater, so I figure I have to turn off the supply to the hot water
heater as well in order to stop that from wanting to leave the heater.

Have I diagnosed my problem correctly, and can I leave the pilot light
on for all this safely? I could have the supply off for as much as a day.
--
Cal