Interesting, but it seems far from self-sustain.
there was a paper on the condition for self-sustain of this kind of looped device...
COP and temperature need to be high enough
https://www.lenr-canr.org/acrobat/BiberianJPjcondensedt.pdf#page=18
(self-sustain on this graph is mode 3)
With water I understand that COP shoul be much above 8, probably like 12... and assuming very good engine anyway.