This notice of intent just out from the DOE. One of their proposed areas of developmental funding is "residential wood heaters" as described below.
"Topic Area 4: Residential Wood Heaters This potential topic area will support the development and testing of low-emission, high efficiency residential wood heaters. Categories of residential wood heaters of interest include room heaters, hydronic central heaters, and forced air central heaters."
https://www.energy.gov/eere/article...sportation-technologies-funding-opportunities
"Topic Area 4: Residential Wood Heaters This potential topic area will support the development and testing of low-emission, high efficiency residential wood heaters. Categories of residential wood heaters of interest include room heaters, hydronic central heaters, and forced air central heaters."
https://www.energy.gov/eere/article...sportation-technologies-funding-opportunities