| BAT | best available techniques |
| CHP | combined heat and power |
| DHS | district heating system |
| ELB | electric-boiler booster |
| HX | heat exchanger |
| GBB | gas-boiler booster |
| HPB | heat-pump booster |
| LTDH | low-temperature district heating |
| SHW | sanitary hot-water |
| SPF | seasonal performance factor |
| TRY | test reference year |
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