i just found this on another site ..
from New Zealand and imported by an company in Bellevue WA.
Thermette water boilers that work on the water jacket-flue
up the middle principle..i have seen these for campers in the
pint and quart size BUT--they also make them in a 30 liter
size with a tap..if you had a need for lots of hot water
this would be just the thing..anything that will burn can
be used to fire this up..they also have 10 and 20 liter models...i don't have a link but Google "thermette" should work