| Similarity | Rank | |
|---|---|---|
| furnaces | 0.900 | 30904 |
| boiler | 0.832 | 13188 |
| heater | 0.813 | 10118 |
| boilers | 0.790 | 25056 |
| heating | 0.788 | 4216 |
| flue | 0.771 | 38443 |
| radiators | 0.751 | 37705 |
| heaters | 0.748 | 15430 |
| firebox | 0.746 | 69140 |
| ductwork | 0.743 | 50140 |
| woodstove | 0.739 | 95240 |
| combustion | 0.738 | 15295 |
| kiln | 0.738 | 29889 |
| stove | 0.731 | 9831 |
| Furnace | 0.731 | 38597 |
| evaporator | 0.730 | 54470 |
| HVAC | 0.730 | 15563 |
| condensing | 0.729 | 47427 |
| exchanger | 0.727 | 36850 |
| chimney | 0.723 | 17271 |
| tankless | 0.723 | 50304 |
| radiator | 0.723 | 21060 |
| sump | 0.710 | 30252 |
| blower | 0.707 | 26235 |
| exhaust | 0.706 | 9598 |