The vertical thing is important!
The water sticks to the side of the pipe.
The more perfectly vertical, the more evenly it is spread. The thinner the layer of water, the more surface area it has per volume to transfer the heat to the pipe.
And IIRC, the thinner the layer the slower the flow, allowing more time for heat exchange.
There is a word for all that, but dang I don't remember what it is.
"anti-laminar flow"? :-)
I shed more than a Shetland pony...
G-
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