I disagree - are you really convinced, that a "nuclear driven" device (I can hardly imagine that the QuarkX or whatever the marketing and the product name may convey, will come to market without mentioning the nature of the heat / electricity generation, which is for sure part of the IFU) will be available for do-it-yourself tinkerers who are keen in building their own home-made-kits? Never - from a safety and regulatory perspective. Modifying a device with a specific intended use to a non-specified non-tested and non-released use of course will always be possible but on your own full risk, unless the product or kit is already designed for that purpose. In that case it must cover potential risks resulting in described modifications anyway (forseeable misuse by manufacturer...)
If you burn down your home due to a failed "modified on your own" QuarkX, you are done. No one will cover your costs/damage...not sure if this will help to promote the device.
I am emphasizing this topic, because it seems that not many here are aware of what it requires to qualify such a new groundbreaking technology/device. It is NOT a simple electrical heater anymore, esp. if it as claimed can run for hours, days and months in SSM. BTW - would you buy a device which energy or heat producing internal system is unknown. It cannot be unknown, since it needs a heavy global marketing campaign. How else can somebody sell millions of heaters or ligth/energy generators from his robotized factories?
As long as cost of energy is > 0 , if you cheaply can build your own people will do it. In essence it is a money printing machine. Will someone ever buy such a machine? Well ... It's way beyond an insurance problem... (and somebody will happily offer that insurance as well) Hey, they do it for cars, and those are really dangerous...
In the end though cost of energy will approach zero. It will be all about bandwidth and information. As Rossi says it will be integrated and energy co's will charge you a flat fee for a 10-100-1000 kW cable, unless you produce yourself. Just like the Internet . Well actually less since there is not any added value to the actual connections in the energy grid only in convenience and reliability (initially at least). But if it can be produced on site easily and reliably that feature will also disappear. No need for expensive transports.