This particular product says it's 800W max. Most residential wall outlets installed in the last 30 years should be able to handle that (in the US). Also, it's a product only available in Europe at the moment where they do 220 through the wall, so less than 4 amps which is stupidly low.

Yes, being able to power your whole house through a single outlet is insane. Unless your house draws less than 800W