Cooll has already showcased a fully functional heat pump operating on a 30% hydrogen blend, as part of the GROHW energy hub demonstration program (https://grohw.nl/). In parallel, a 100% hydrogen combustion chain was developed. Testing of this combustion chain takes place throughout the first half of 2024 and this will result in a Cooll TDHP running on 100% hydrogen becoming available in the second half of 2024.