| with a copper heat exchanger | 5 | other |
| pool → have → heater | 21 |
| pool → be equipped with → heater | 5 |
| pool → need → heater | 3 |
| pool → come with → heater | 3 |
| negative | neutral | positive |
| 0.213 | 0.566 | 0.221 |
| Raw frequency | 32 |
| Normalized frequency | 0.346 |
| Modifier score | 0.850 |
| Perplexity | 198.741 |