Livin' on the edge with no clamp on that hose on the effluent connection. Or is that the inlet to the RIMS tube? EIther way, that's a sticky mess waiting to happen. I've learned (the hard way) to put clamps on ALL barbed connections. They're a bit of a pain to remove when cleaning, but that's still a lot easier than cleaning up wort that's sprayed everywhere, never mind losing the wort you just put all the effort into.
I was planning to draw from the bottom of kettle, through the pump, go in the bottom of the RIMS tube, with the temperature sensor at the top like you have yours plumbed, and a hose to return it to the kettle. If I keep the Rims tube below the level in the kettle, it should purge any air from it and avoid dry firing the element. Yours looks like the flow may be top to bottom, with the heat AFTER the temperature sensor. I'm basing that statement by what appears to be a tri-clamp connection at the top bung of the kettle. Am I seeing that wrong? It'll require some thinking, but I"m hoping to be able to put a QD fitting on it so I can connect it directly to the pump outlet. Might need a 90 and a nipple to turn it. Keeping the hoses as short as possible will likely be important as well to minimize heat loss.
My thought process is I still want the column vertical to protect the heating element, but I think I want the heating element "ahead" of the temperature sensor so that I can cycle the element based on wort temperature going back into the kettle (after heating) to eliminate swings and prevent overheating the wort. I don't want to over design this, but I do want to make sure I'm not 'cooking' the wort and hosing up conversions because I put the sensor in the wrong place. I've noticed that the more I try to manually control mash temperatures, the more I overshoot and the more I miss target FG's.
Do you just run full flow from the pump, or do you control the flow with a PID?
@Ozarks Mountain Brew are both outputs of that controller PID?
This is the little bang bang I was going to use with a couple pilot relays, just like what I used for the fermenting fridge. If I do this right, I may be able to use the same control box for both mashing and fermentation temperature control, but these are cheap enough to by more. I can get 'em for about $20 each.
Inkbird Temperature controller
I can program the delay so it doesn't dither too much when close to temperature. My main objective as stated is to prevent scorching the mash which is hard to avoid using gas burners. Had I known then what I know now, I would have bought an electric kettle instead of the burner.
Speaking of gas, I need to go get some propane tanks refilled today.