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I got a FloJet pump off eBay. Think it's too much for a home-brew setup, more like a pump that would be used in a proper high commercial brewery, but it works fine and doesn't seem to be causing any issues. I have a ball valve on the output to throttle it back. Most people seem to use those small 12v submersible pumps you can get off eBay. You don't need anything with too much power for a homebrew setup since you're not pumping glycol through hundreds of feet of line. This is what my mate uses with his bucket. He has a Grainfather fermenter so uses the universal glycol pump kit which utilises a very small submersible pump.
You are now reheating the Gycol. Why not just take some out, or get a bigger coolbox.
so long as it works of course. Unfortunately I'm space limited so no room for bigger coolbox, plus coolboxes are expensive, and wanted to have a smaller volume of glycol to have less volume, minimising surface area of heat transfer, to get it down to its lowest possible temperature. And ultimately the coolbox still has a larger volume than the bath in the maxi chiller...Also in reality the glycol circulation is very low so not dumping large volumes of slightly warmed glycol into the volume, it's basically a smidge above a trickle, so I should have more than sufficient cooling capacity from the circulating water through the coil. The relative flow rate of the cooling water through the coil will be far far higher than the flow rate of the incoming glycol so plenty of capacity to suck the heat out of the glycol. But the proof of the pudding will be in the eating. If this doesn't work I'll be revising the entire setup.
