Wayne.B wrote:
Okay, so now we now that the barrel is immediately above a head and
plumbed to some sort of chase that runs down to the keel.

Pressure water system for the owner's shower.

Sun hits barrel, heats water, gravity feeds it below.

Modern plumbing and engineering at work. Who needs electricity?

I just got a better look at the plans it seems to have a pipe running
straight down the wall on the outside of the head going into a box that I
think is a small heater. It could be an electrical box but it is protrudes
from the wall.

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