Making an insulated rocket stove hot water system

It's sooo good.  Elegance and practicality combined to create an efficient water heater.  Heated 80 litres of water from 30 C to 70 C in 1.2 hours.    Probably one of my better looking and performing stoves and potentially could develop this into a laser cut product.  
Let me know if you are interested if you are within Australia.
If you would like to support us in what we do within Australia check out our website at www.littleaussierocketstoves.com