What does NORA identify as a major advantage of modern oilheat systems?

Modern oilheat systems are recognized for their enhanced efficiency and reduced emissions compared to older systems, making this a key advantage as identified by NORA. The improvements in technology and design in contemporary oilheat systems allow for more effective combustion processes and better heat transfer, which results in a significant increase in energy efficiency. This means that less fuel is required to generate the same amount of heat, which not only reduces energy costs for consumers but also minimizes the environmental impact due to lower emissions of greenhouse gases and pollutants.

In contrast, the other options, while they may have merit in certain contexts, do not encompass the primary focus of NORA's advancements in modern oilheat systems. Lower installation costs, fuel availability, and operational noise levels are also important aspects, but they do not capture the significant technological improvements associated with efficiency and emissions reduction that NORA emphasizes for the benefit of both consumers and the environment.