The blurb says it has a teg (thermoelectric generator) of some sort.
There was a discussion on the topic on here recently. Jenlyn was planning to fix about 400w of teg to his 9kw stove and telly matches was winding him up about burning more fuel.
I could see how a furnace designed to burn at very high temperatures could be quite effective at producing electricity despite the inefficiency of the seebeck effect.
Its going to use shed loads of fuel but you could burn almost anything on it if its hot enough including routinely burning boxes of your own (and other people's) shit if you wanted to.
Sounds quite good but probably too much heat output so very inefficient I expect. The marketing seems to rely on the assumption that you have an almost endless and very cheap source of fuels.
Eta it could even be worth inviting other people to empty their shit into a tank (for a fee) with some sort of seperation and drying plant followed by injection into the combustion chamber of the stove.
A shit powered generator where people actually pay you to use their fuel.
Once you seperate the moisture out the rest (shit and paper) is pretty flammable given a hot enough burn temperature.
Waste heat to be transferred to the waterway to attract fishes which you then get out and eat for dinner and burn their bones.
Handy also for Mrs tabby to get rid of dead 'oars and scrotes.
Just think of it as a shit powered eberspacher. It would need to be larger so probably only suitable for people on relatively big boats.
Narrow boats are a bit small for one of these units I suspect.