When I lived on one I approached a farmer with a field adjoining the canal and said how much to moor here half the year, all I need to do is walk across the field and through the gate to the road? We agreed on about £700 a year. The rest of the year I moved about, you could stay at any public mooring for 2 weeks for nothing. There was an annual fee for using canals, that was a bit more but not eye watering. Electricity came from a wind generator and the engine when moving charging up leisure batteries. Heat from coal, Gas from large bottles.
It all came to much less than I was renting the house out for.