Campbell Ritchie wrote:Which countries are rocket mass heaters conformant to building regulations in?
Quite a few. And growing.
Of course, I think people should treat rocket mass heaters just like they did pot. Be perfectly obedient to the government. It doesn't matter that it solves climate change, or that it saves you thousands of dollars while keeping your house even warmer. Do not build one until the government says it is okay - just like how nobody touched pot until the government said it was okay.
In some places it is classified as a masonry heater. In others, the building codes recognize rocket mass heaters.
BUT THE MOST IMPORTANT THING IS:
to get your head wrapped around what it is and how they work. At least as much brain space as you have for a nuclear reactor. After all, you have a pretty good idea how those work even though they are not in your building regulations.