From what i could read and understand, it doesn't use resistor heating element.
Its as efficient as a heat pump, but with very low maintenance, since it doesn't have mechanical parts.
It also heats water instantly like heat pump, unlike resistive heating element.
It can heat water till 90ºC unlike heat pumps.
Liquid used inside the "heating element" must be changed/refilled every 4/5 years.
They claim Ionize/electrolysis! (using 2 electrodes)
I am curious about how that thing works. And would i be able to build one my self
Regards
Goahead