In Germany
The German government promotes CO2-neutral heating systems as part of the "Federal Funding for Efficient Buildings" - BEG for short - with high subsidies. Subsidies of up to 70 percent are currently available for your Re² pellet boiler in Germany!
Retrofitting particle filters is subsidized 
Watch out: Retrofitting filters is subsidized with 50%.
KfW
In addition to the subsidy, a low-interest KfW supplementary loan for eligible expenditure of max. € 120,000 per residential unit (non-residential buildings max. € 500 per m² GFA) in Germany can be applied for via the house bank. For owner-occupiers with a household income of max. €90,000, an interest rate advantage of up to 2.5% is granted.
In Austria
The subsidies range from an average of 75% of the investment costs to 100% funding for low-income households as part of the "Clean heating for all" subsidy.
For private
Pellet heating systems
Changing to a pellet heating system from a fossil heating system:
Austrian campaign "Clean heating for all"
Support for low-income households switching to climate-friendly heating systems
All information without guarantee. Status: 03/2024 - Subsidy guidelines may change at any time. No claim to completeness. Subject to errors and changes. The subsidy rates refer to the eligible costs for the measure applied for. The decision on eligibility for funding is the responsibility of the countries.