Oh god. Not this again.
For any of these things, this is what I want to see:
1. Run heat engine+generator off the heat "output"
2. Put that electric power back in to its required inputs
3. Sever all other connections
4. Ideally, mount it in an insulated, shielded box, but that really isn't even necessary, as 1-3 is more than sufficient to prove its a fraud
5. Turn it on.
If it's stil, on a week later, hell, a DAY later...ill start listening.
In -all- of these, it's always a "electrical power in, heat out" which makes it super easy to have "excess" energy due to measurement error or outright fraud.
Secondly, as AJ pointed out...at the temperatures its operating at, if it needs electrical in, and the heat output is 3x the electrical input, that would mean EVEN IF THAT WERE TRUE, it would basically be a null-production, as most heat engines at those temps are not much more than 33% efficient.