Not sure about ROI, last time they announce the price tag was $450 per unit, which matches or is lower than many available in the market. So, this is not like Prius that you have to pay premium to use a cool stuff. Personally, I think they could price higher.
The way I see this technology is not from ROI standpoint. I see that it will simply replace the existing electric tankless water heater or those water boiler in numerous applications in all new units. It becomes a new standard technology or at least has a league of its own. That is huge, IMO. Go WDRP....
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