Hydrosonic heat pumps efficency of electric motor making steam, heat or power ?

Question

Saw on YouTube

Answer 1

The whole point seems to be to avoid scale on surfaces.  Making steam would still leave it in the water left behind.  The idea seems to be that this would be a good hot-water heater if you have to use electricity, and have lots of up-front money for the cavitation device.  

Heat would be 100% efficient using the power that drives the motor directyl, and more reliable without the motor or pump.  

If the power for the motor comes from burning coal, it would be more efficient to co-generate for heat.

Answer 2

Using cavitation to create heat is not something I would recommend at home, those "collapsing bubbles" can tear metal apart, too, if they impinge on pipe walls when they collapse.  It may have very specific applications, but will never find widesread use for HVAC.