My first try at heating up water with a rocket stove. It raised the temperature of 5 gallons of water 60.5 degrees Fahrenheit / 15.8 degrees Celsius in an hour and a half.....

Com: Starpuss : I would of put Heat exchanger right on the Exhaust of the stove, Or Make the Stove itself the HE , Another pipe on outside , water jacket , And Longer Exhaust . And Cooper Pipes Around it also.

Com: Patrick savyer : heat exchanger should be IN the exhaust plume, not added to the outside. Also, add fins to both the houtside (to soak up more heat) and to the inside (to transmit the heat to the water) to improve the efficiency.

Com: Scruffless: A suggestion on improving heat transfer: Create a tightly wrapped coil of copper piping (10 to 12mm or so) and have this INSIDE of the fire tube (maybe make the stove out of round piping also rather than square tube..?)

The smaller bore piping is important here, you may even have to put a pump on the cold water intake as the output of the coil will be close to boiling.. I'd really like to see this being done but I'm currently not in a great position to try it..

If anyone has done something similar before please leave a link here (or on my channel if links aren't allowed here). It would be greatly appreciated :)