Which type of heater must be personally supervised by a Certificate of Fitness holder at a construction site?

The need for personal supervision by a Certificate of Fitness holder at construction sites specifically applies to portable fueled space heaters, as these devices present significant safety risks due to their potential for fire hazards and carbon monoxide emissions. Given that fueled heaters operate using combustible materials, they can create dangerous conditions if not monitored closely.

Portable fueled space heaters can be easily knocked over or improperly fueled, increasing the risk of fire within the often congested and variable environments of construction sites. Therefore, having a Certificate of Fitness holder present ensures that proper safety protocols are adhered to, including monitoring the use and maintenance of the heater, ensuring adequate ventilation, and being prepared to respond to any incidents.

In contrast, electric heaters, fan heaters, and wall-mounted heaters generally do not have the same levels of associated risks when used properly, which is why they do not require the same level of supervision. This distinction underscores the necessity of having trained personnel specifically supervising the use of portable fueled space heaters in construction environments.