| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | boiler | Northern Europe | Essential household item for heating and hot water in cold climates | 1 |
| 2 | boiler | Northern Europe | Common household item, essential for central heating and hot water supply | 1 |
| 3 | boiler | Northern Europe | Common household item used for central heating and hot water supply | 1 |