(1: Preheat) I recently purchased an Infussion Mash Tun and have brewed one batch with it. I lost far more heat than expected in the mash (about 5 degrees), despite also using the MTSs (which I now think was a huge waste of money), which makes me think I preheated it incorrectly. I filled it up about halfway with 150 degree water and let it sit for about 10 minutes. My target mash-in was 155, which I hit, and it was 150 after 60 minutes.
I'm wondering how anyone else who owns this mash tun preheats it.
(2: Temperature Readings) Where do you measure your temperature from? I've always used a Thermapen in the top of the mash. I checked the Thermapen against the temp probe (MTSs), and found the temp probe to be spot on surprisingly. However, when I mashed in and over the course of the mash, the probe in the middle of the mash read about 5 degrees hotter than the Thermapen at the top.
Is this just a matter of hot and cold pockets, and which measurement should I be relying on? Going with the Thermapen makes me feel a bit more comfortable since I know how accurate it is, but then this makes the MTSs system irrelevant. Like I said before, the MTSs just might be shaping up to be a waste of money...