No — they run in parallel and cover different emissions. An industrial site can be in ETS1 for its big boilers AND feel ETS2 in purchased fuels for smaller uses.
From our guide: ETS2 Explained — 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: