I was experimenting with Big MIDGE last night. Attempting to find out the minimum amount of wood chips I would need to boil 1 litre of water. Not much was the answer. Approximately 200g is the amount of wood chips required.
It is surprising how efficient these MIDGE stoves are. They produce no smoke, can be used indoors so long as there is adequate ventilation, and produce little ash. They give off an awful lot of heat and most of it is directed precisely where you want it.
Upcoming experiments include constructing a heating coil from copper pipe and attempting to heat a larger mass of water using the thermosiphon effect. I would like to heat enough water for one or two showers, washing the dishes and a cup of coffee per day.
Ultimately I would like a larger gasifier that during the course of a day can heat a large heat store. This store would be a heavily insulated tank holding 10,000 or more litres of water. The intention would be to heat the store to provide enough heat for a week of hot water and underfloor heating.
A wood gasifier is ideal for this as it is very efficient. Most of the heat generated would go into the store. The wood chips would be simply created from waste wood mass. There would be no need to fell large trees, which could then be sold on for income rather than my burning here. Besides, chainsaw work, bucking and splitting does my back no good at all.