Israel’s TurboGen has developed a micro-turbine gas boiler that is powered using 50% hydrogen and 50% natural gas (methane). The TG-40 microgenerator produces 50% of the CO2 produced by a conventional gas boiler. TurboGen is working to develop a 100% hydrogen micro-turbine.
https://www.israel21c.org/your-home-could-be-heated-by-non-polluting-hydrogen/