Hot effluent down the drain, stenter exhaust to roof, bare steam lines. Effluent heat exchangers + insulation typically cut 15–25% of thermal demand.
From our guide: Decarbonizing Textiles & dyeing — 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: