We think that there are no current US federal-level tax credits for the installation of masonry heaters.  We do not know about any specific state-level programs either.  If you know of any examples to draw resources from, please let us know!

Here is a tiny step of progress towards having Masonry Heaters recognized as legitimate modern local biomass fuel burning appliances:

Letter to Jeff Merkley Re BTU Act

 

Response from Merkeley