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Just wanted to share my unconventional build. It is not complete, but has kicked out one crude IPA. I hope you enjoy. Always follow the electrical code of your location. I have about $300 invested so far. Here is an overall shot of the stand, which was fabricated from mild steel then...

15.5" I cut the tops off

1" NPS should be 1.315 OD exactly, but it seems that these elements come in lower to ensure fitment. They typically come with an over sized elastomeric type seal that should work. I would measure your element and seal first and then cut the hole. I wonder if it can handle the heavier gauge...

Do you have any details on how you set up the one wire network with the arduino? Thanks

Yeah I don't know it just says "GE 50 Amp 240-Volt 240-Watt Non-Fuse Metallic Spa Panel Disconnect with GFI" Then if you click on specifications it says it again 240W. I hope they meant 50 A X 240 V = 12kW Maybe it is the power you get shocked with before the thing trips off -haha.

That home depot GE spa panel says "240W" in the heading. Does anyone know what that refers to or why that is in there? GE's website doesn't say anything like that.

Yes 4 lead RTDs allow more accurate temperature measurement in fancy setups where the current source is connected to one pair and the voltage drop measurement is on the other pair. The current carrying leads contribute a resistance that you don't want in your measurement. Volt meters, on the...