From wikathingapedia:

"The watt is named after James Watt for his contributions to the development of the steam engine"

burning 800 of him a day could be considered another holocaust.!

I presume they mean the house runs at an average of 800W which seems reasonable. That would be 19.2 KWh per day or about £1.80 per day where I come from.

I highly doubt that's what it means.  Running a house at 19.2 kWh a day is nothing to write home about.  I doubt they'd be making a big deal of a home design of that nature.  19.2 kWh is a fair amount of energy, and not especially good.