Hope you don't mind me chiming in on this.
While pre chilling will help with the cooling process, it only makes a marginal difference.
Increasing chiller surface area has a much more significant effect.
I got rid of the pathetic coil that came with my Brewzilla years ago.
First I built a double pass chiller using 100' of 3/8" copper tubing, that thing was incredible, chilled to pitching temp in like 7 minutes and filled 3 buckets with piping hat water.
I now use a counterflow chiller, by adjusting chilling water flow I can pump straight into the fermenter at pitching temp. I pipe to chilling water to drain, haven't calculated how much water I use with the CF chiller. In my current brew space I don't really have the space to save hot water for clean up unfortunately.
This was dubbed Frankenchiller by someone here on the forum.
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