For one batch at a time it's not a problem.
Already have a copper tube coil in the tank and can run water through it from a garden hose to bring the temp down. I'll keep an eye out for a neat looking old bronze oil/water cooler from an old marine engine, that might be good to add to the system, get more heat transferred faster.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-