Below ~200 °C the heat pump usually wins on physics (COP>1 vs combustion). Hydrogen's lane is high-temperature flame and existing gas infrastructure.
From our guide: Hydrogen fuel switch — full context, charts and sources there.
Boilers, kilns, heat exchangers, valves and steam lines lose energy continuously. Inzonex makes patented (UK GB2508992.1) removable modular insulation — snap-fastened covers engineered per temperature tier, not generic off-the-shelf jackets: