 |
| heating device: 23 phrases in 15 subjects |
| Astronautics | 3 |
| Building materials | 1 |
| Construction | 1 |
| Electrical engineering | 2 |
| Electronics | 1 |
| Energy industry | 2 |
| General | 2 |
| Medical | 1 |
| Medical appliances | 2 |
| Public utilities | 1 |
| Refrigeration | 1 |
| Security systems | 1 |
| Technology | 2 |
| Thermal engineering | 1 |
| Tobacco industry | 2 |