Which type of heater does NFPA pamphlet #54 restrict from being placed in bathrooms?

The correct answer is unvented space heaters, as NFPA pamphlet #54 outlines specific safety guidelines regarding the installation and use of various heating appliances to mitigate the risk of carbon monoxide accumulation and ensure proper ventilation. Unvented space heaters can produce combustion gases that must be adequately vented to the outside. In confined spaces like bathrooms, which typically lack sufficient ventilation, the use of unvented heaters poses a significant safety hazard. The risk of carbon monoxide poisoning and the potential for inadequate oxygen levels in such a small, enclosed area contribute to the restriction on installing these types of heaters in bathrooms.

Other types of heaters, such as electric heaters and portable heaters, may have different safety protocols or usage recommendations but do not face the same restrictions as unvented space heaters regarding bathroom installation. Wall-mounted heaters can be installed in bathrooms if they are designed for such spaces and meet specific safety standards. Understanding the specific limitations of unvented space heaters in this context emphasizes the importance of following the guidelines set forth by the NFPA for safety and compliance.