Hot water/room heating for shack dwellers

I invented a special hot water unit which does not require electricity. Batteries or anything that can heat up (produce heat) can be used. There is definite limits to the type of source and that's where my proprietary information is required to make it work safely. The unit at 200 degrees Celsius will be able to be touch by hand and won't be a danger to children playing around it. In winter the excess heat can be used to heat up the house. I tested the unit against Eskom with a 50% saving in electricity cost. Implementing my proprietary heat source can bring that expense down to around 90%. 100% Ozone friendly. No dangerous fumes.