- Baseboard heating equipment manufacturing
- Boilers, heating, manufacturing
- Burners, heating, manufacturing
- Fireplace inserts (i.e., heat directing) manufacturing
- Furnaces (except forced air), heating, manufacturing
- Furnaces, floor and wall, manufacturing
- Gas burners, heating, manufacturing
- Gas fireplaces manufacturing
- Gas space heaters manufacturing
- Gas-oil burners, combination, manufacturing
- Heaters, space (except portable electric), manufacturing
- Heaters, swimming pool, manufacturing
- Heating equipment, hot water (except hot water heaters), manufacturing
- Heating units, baseboard, manufacturing
- Hydronic heating equipment manufacturing
- Kerosene space heaters manufacturing
- Logs, gas fireplace, manufacturing
- Oil burners, heating, manufacturing
- Radiators (except motor vehicle, portable electric) manufacturing
- Room heaters (except portable electric) manufacturing
- Solar energy heating equipment manufacturing
- Solar heating systems manufacturing
- Space heaters (except portable electric) manufacturing
- Steam heating equipment manufacturing
- Swimming pool heaters manufacturing
- Unit heaters (except portable electric) manufacturing
- Wood stoves manufacturing
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