So if your only going to fill it up once surley it will run low each time you take a coffee and the steam that replenshes from the smaller vessle to the larger vessle will be a smaller amount than that taken for the beverage. So no matter what you would have to fill it more than once surely. You could have a line outside running in from a funnell through a vent in the wall that collects rain water and if you put the tap almost shut to a drip this should compensate. Futher you could have a small overflow pipe from the kettle to the sink in case of overflow. Nah Bollocks it would take up to much kitchen.
just how fooking stupid can yer get?
without letting all the secrets of the water powered kettle out, lets just say it has a self enclosed mini atmosphere which can sustain all the water than the kettle needs to operate fer ever on only one fill up.
it takes the molecules of all the other elements that make up un pure water such as yer get in yer tap.
(when ah say unpure ah dint mean poisonous but mearly water wot got more than just hydrogen and oxygen in it)
the 'other' molecules are chemically and/or ecetricklally transformed into either hydrogen or oxygen. this method ensure a constant and ever ready supply of water .
IF, and its a big if, the water level should still fall , any discrepancies will be made up by the patented slob's magic water maker which is installed in each and every one of wur water powered kettles.
so yer see there really is no need to fill up more than once.
.....
update fer bushtwot..wur boffins have nearly mastered the slob's magic unblockable coffee filter so you should soon be able to by wur water powered coffee perculator in a store near you once we find a seethh eeffrickcan we can trust to act as importer and distributor.