So, according to this: http://newenergytimes.com/v2/news/2011/37/3709appendixa4.shtml
We have 383W for the hose and 100W inside the hose. If the flux is 1.5g/s, we have 75*1.5*4.184 = 470.7W to heat the water up to boiling point. The total loss is around 950W. The alleged output is 4700W , so we have 3850W out of the hose. If all just comes from the wall power plug, we have 800 - 483 = 317W available to heat water. So, the quantity of steam is x=317/(75*4.180 + 2260)=0.12g/s. If the output steam looks like a 800W boiled water, we have 0.35g/s out of the hose. The energy to boil that is 75*0.35*4.180= 110W. So, we have a total of 380+100+110+800 = 1390W. So, a gain of 75%.
