| English | eng-000 |
| calorific efficiency | |
| 普通话 | cmn-000 | 热效率 |
| English | eng-000 | fuel efficiency |
| English | eng-000 | heat efficiency |
| English | eng-000 | thermal efficiency |
| English | eng-000 | thermischer |
| русский | rus-000 | коэффициент теплоотдачи |
| русский | rus-000 | теплотворная способность |