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Don't use your HLT for the heat exchanger, pick a smaller volume (2 L or so) to give the PID more control over the temperature. People around here tend to favor electronic kettles, which easily fit 5 m of 8 mm copper coil. Add a T joint to the coil's output, and stuff your temp sensor in there...

Aren't you better off with an independent heat exchanger in the 0.5 gallon range for your HERMS? Smaller volume gives your PID more control, and you're free to focus on hitting strike temp with the HLT. 1.5-2kW still sounds reasonable, you can fit a lot of copper coil in that space.

By all means. I like the topic, but because of all the misinformation and bad practices in the first 25+ pages, which isn't people getting going off on tangents, I don't think this thread makes a decent intro to wild yeasts and should be stickied with "howto" in the subject line. I think I came...

Thanks! I eventually wound up buying a pre-built fan speed controller from ebay, which was cheaper than the pots i could find.

How does the math work for safely running a 12V DC, 0.14A computer case fan on, say a 9V, 0.5A power source? What kind of resistance do I need from a pot? I thought it was all about the voltage and that these things wouldn't draw more amps than needed, but frying the cheapest 12V brushless fan...

This thread really should be unstickied, locked and buried in a deep hole. While the first post sort of contains some facts, it's also open to misinterpretation. The following 25+ pages (that's as much as I could manage) mostly serve to lead people further astray. Capturing and isolating yeast...