Hi chaps, first post. I have one of these, bought directly from China via Alibaba, it comes from a factory called Guten. I now live in Aus and a few of us have these units now, I've only done 2 brews on mine, not had any issues with the element thankfully but wandering if its possibly caused by running the element too high for too long.
I generally program mine like this:
S1 - 73C, 1 min, 2500W - This is to heat the water before mashing in
S2 - 67C, 60min, 1500W - Mash time, I actually find setting the power higher causes the temp to fluctuate more, hence around 1500W it seems to be more stable
S3 - 78C, 15m, 2000W - Mash out if you do this step
S4 - Boiling, 60-90m, 1800w, I find this gives a nice boil
Of my two brews only had minor residue on the heating element and that was easily wiped off the paper towel.
I have encountered 1 issue with mine so far, the temperature was reading all over the place and even when the water was almost boiling it was reading 1C. I ended up taking it apart and finding that the temperature cable had come disconnected from the PCB, which could have been caused by me as I checked the pump was clean of trub after my first brew. Anyway reconected and expected that to be it, however it continued to do the same which put the brewday in jeopardy. Eventually moved the machine back into the garage and turned on and it was now working ok, hence I suspect the connection isn't great. Managed to get the brewday on without further issue, but one to keep an eye on.
On the + side I contacted the company in China immediately via Alibaba and they responded within the hour, asked me to send them video of the issue so they are willing to help out and honour their warranty.
My 2nd brew day went well, put on a double IPA but was aiming for 20L into the fermentor but ended up with only 16L, I used beersmith for the planning but obviously my equipment profile was out, hence thanks to magic pancake for posting his profile. My DIPA might end up being a barley wine, 21.8 on the refractometer!!