[Wonder Warthog]

"It will need to be demonstrated as working safely for years in controlled commercial/industrial environments before it will be approved for home use."

Which is precisely his stated "game plan". But there are hints that the good performance of his 50 cc unit has caused him to move "home applications" up in his mental priority list. Here follows GROSS SPECULATION....the reason for that is that the small unit shows little or no tendency to "run away", as the larger units do. It actually REQUIRES the external heater to stay running.

[PapaBear3625]

the reason for that is that the small unit shows little or no tendency to "run away", as the larger units do

The initial residential applications would be for home heating and air conditioning (cooling using the ammonia absorption cycle. Heating and cooling account for most home energy costs in the US.