The rocket stove was able to effortlessly heat 80 liters of water to 70°C in a little over an hour using a few scraps of wood. The metalworking skills of [Little Aussie Rockets] are also on full ...
and he notes that simply doubling up the tubing would increase the heat transfer to the water even further. If you’re looking for a hot shower from your outdoor wood stove, a build like this ...