thomas rubino wrote:Hi Anja;
Big Welcome to Permies!
You will be able to have a Rocket Mass heater in your house.
Yes, a solid concrete floor is ideal but most are built on a wood floor.
You simply need to spread the weight over many floor joists and maybe add some extra support in the basement.
Depending on the style and size RMH (piped bench or brick bell) your RMH will weigh in between 2000-5000 lbs.
That sounds like a lot, but a waterbed weighs about 2000lbs. People have been putting them in bedrooms without ever thinking about supporting the floor.
Your issue after floor support is protecting that wood floor from the high heat.
A bell design RMH has very few issues with floor heating as the highest heat is at the top.
A floor mounted core and a piped bench must be elevated apx. 2" above the floor. Generally bricks laid flat with cement board on top is suitable to elevate the core and mass.
Do not attempt to attach you rmh to the stone walls of your house. It must be isolated from them or your heat will transfer to the great outdoors.