- Burners, furnaces, boilers, and strokers (7)
- Boilers, low-pressure heating: steam or hot water (4)
- Furnaces, domestic steam or hot water (1)
- Gas burners, industrial (3)
- Gas-oil burners, combination (1)
- Oil burners, domestic or industrial (4)
- Radiators, except electric (1)
- Space heaters, except electric (1)
- Gas infrared heating units (2)
- Heaters, swimming pool: oil or gas (2)
- Solar heaters and collectors (9)
- Stoves, wood and coal burning (2)
