Brewed 3x in mine so far, every time it's lost about 1.5*-2* in a 75 minute mash. This is with ambient temps around freezing (or 18* last time), so I'm very happy with it. I've noticed no less drop in temperature with this than the regular cooler AS LONG AS IT IS PREHEATED A BIT. The increased thermal mass of the stainless pot/liner will suck more heat out if it's 35* when you throw your strike water in. I just put a gallon of hot tap water in it while heating my strike water which solves the problem.
Attached are the photos I promised so long ago. Forgot to take a photo of the lid, which I attached to the stock rubbermaid lid for insulation, but it keeps temps perfectly. Thanks for the great idea Ben!
I'm debating on selling this and upgrading to a larger mash tun as I found an amazing deal on a Blichmann 15 gallon, but it's going to be very hard to find something that insulates as well as this.
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-kincade
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