| Answer | Crossword Clue |
|---|---|
| SOLAR | Kind of heater |
| ETNA | Heater of a kind. |
| OILSTOVE | Type of heater. |
| SPACE | Type of heater |
| RAYGUN | Heater of the future |
| ETNA | Heater of a sort |
| ETNA | Lab heater of old |
| COALSTOVE | Potbelly heater, of a sort |
| PRESSUREVALVE | Part of a water heater |
| SAMOVAR | Water heater, usually made of copper. |
