| Similarity | Rank | |
|---|---|---|
| boiler | 0.911 | 13188 |
| furnaces | 0.896 | 30904 |
| heaters | 0.837 | 15430 |
| gas-fired | 0.836 | 70372 |
| radiators | 0.833 | 37705 |
| Boilers | 0.797 | 88559 |
| heating | 0.797 | 4216 |
| chillers | 0.796 | 71691 |
| furnace | 0.790 | 12662 |
| underfloor | 0.778 | 66006 |
| pipework | 0.776 | 80616 |
| stoves | 0.775 | 24916 |
| condensing | 0.775 | 47427 |
| coal-fired | 0.774 | 36383 |
| firebox | 0.770 | 69140 |
| combustion | 0.767 | 15295 |
| turbine | 0.765 | 13697 |
| flue | 0.762 | 38443 |
| turbines | 0.760 | 14713 |
| steam | 0.759 | 5583 |
| heater | 0.758 | 10118 |
| exchangers | 0.753 | 59321 |
| ducted | 0.751 | 91724 |
| tankless | 0.750 | 50304 |
| cogeneration | 0.748 | 76666 |