Heat lost from a pipe was generated by a boiler that is not 100% efficient — eliminating 1 kWh of standing loss saves roughly 1/0.82 ≈ 1.22 kWh of fuel at a typical 82% efficient system.
From our guide: Carbon Savings Certificate — 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: