Wood Burning Boiler - the economical way to heat water!

In this next blog, I wish to introduce a stove that burns wood in an efficient manner.
Rhodesian Boilers are commonly found in this country at campsite ablution blocks. They often consist of a 45 gallon drum supported horizontally on bricks with a fire underneath burning basically all day – the heat escaping in all directions! Where trees abound, this extravagance may not matter but deforestation and high consumptions of charcoal mean that the humble firewood is becoming scarce. Much is wasted in annual bush fires too.
However, with this boiler design, one 4kg fill of wood is enough to heat a tank to 800C in 2 hours.
Of course, if using it to feed an (elevated) hot water storage tank, one could run the stove continuously.
So have a look. To date, 2 boilers have been made. The second is heating water for a guesthouse.
Dusty.