| e | Specific exergy (J/kg) |
| E | Exergy (J) |
| H | Calorific value (J/kg) |
| Q | Heat (J) |
| T | Temperature (K) |
| Greek Letters | |
| η | Efficiency (/) |
| Subscripts | |
| a | Ambient |
| c | Cooling |
| CH4 | Methane |
| ex | Exergy |
| h | Heating |
| in | Input |
| ov | Overall |
| s | Superior |
| shw | Sanitary hot-water |
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