- Burners, furnaces, boilers, and strokers (2)
- Gas burners, domestic (2)
- Gas burners, industrial (2)
- Gas-oil burners, combination (1)
- Oil burners, domestic or industrial (2)
- Stokers, mechanical: domestic or industrial (1)
- Heaters, swimming pool: oil or gas (1)
- Solar heaters and collectors (9)
- Steam heating apparatus (2)
- Stoves, wood and coal burning (2)
