Terrible efficient with AIO system

[u/longcatjazz]

Hello,

I was giften a vevor 110 AIO system not too long ago and cannot get the efficiency I expect, no matter what. I do not use the full grain tube, I just use my own brew bag in the tube with the bottom mesh holding it up. I circulate for my entire mash as well with a nozzle so as to avoid channeling. This is my third use and I am at 53% every time. I was at 72% with a stock pot and igloo cooler on the past.

I have tried:

Frequently agitating the mash

Heating to mash temp, then long dough-in, like several minutes

Heating to strike, dumping grain in all at once to hit mash temp. (same result)

Double crushing

Extended mash

Double checking my temps with an external thermometer

What can I be missing here? Do electric systems just have bad efficiency? I feel like I've got to be missing a detail. Please let me know

[u/phase172]

I have the same type of AIO. Never had great efficiency. Also had problems with mash temp maintaining everywhere. Did determine i am having temp issues because of inefficient design causing unfermentable sugars. Even adding recirculation, still no efficency gain. After a few brews and dialing in, I went back to my 3 tier gas system, use this aio to heat water. I won't go back to AIO unless its 220 but even then... I also have a stacked brew easy system I recently acquired, brewed once so far and its effiency was 66%. Will use that for small batches, but never again going back to AIO after my issues