Tony, i had one year physics at university... (did mathematics), but i neither understand their calculations...
Seems logic to me the energy you put in, will be transferred to the water, if other companies with their devices claim they are 99% efficient, why not WDRP?
I don't know anything of thermodynamics and especially not microwaved thermodynamics...
Hoping for the best, but being prepared for the worst...
:o(