I’d go with closed cycle Stirling engines. Even better efficiency than open water boiling.

The general rtg use cases care less about efficiency than long term reliability though so that’s why they use thermocouples. But it would be reasonably trivial to use a Stirling engine instead (unless you’re going to extreme environments where mechanical parts no longer work well)

I'm not sure it is: from that Wiki page, it sounds like RTGs can't quickly ramp up/down power generation or turn off, which that Westinghouse page says can be done.

They make heat constantly. You’re free to convert that heat to electricity or not at your leisure though. It’s no different to choosing not to draw power from a solar panel in the sun. Not a problem.

You probably could, but aside from the black helicopters showing up at your door, the fuel wouldn't exactly be cheap to purchase.

Don't RTGs generate power constantly? That would make them impossible to use for a casual customer.

1) Sell the power back to the power company (granted, at the wholesale price)

2) Use the heat given off to generate more power

Such a convenient space heater wouldn't ya know?

Possibly. I'm not sure what you would do with it in the summer though. Even Arctic and Antarctica have pretty big seasonal temperature variations.