- Burners, furnaces, boilers, and strokers (6)
- Boilers, low-pressure heating: steam or hot water (5)
- Gas burners, domestic (2)
- Oil burners, domestic or industrial (1)
- Stokers, mechanical: domestic or industrial (2)
- Logs, gas fireplace (1)
- Heaters, swimming pool: oil or gas (2)
- Solar heaters and collectors (29)
- Steam heating apparatus (1)
