What is a possible drawback of non-catalytic low emission appliances?

Non-catalytic low emission appliances are designed to burn fuel more efficiently and produce fewer emissions compared to traditional appliances. However, one of the drawbacks is that they need to maintain high temperatures consistently for optimal performance. This is important because non-catalytic systems rely on achieving certain temperature thresholds to ensure complete combustion of the fuel, which minimizes smoke and particulate emissions.

If these appliances do not maintain the necessary high operating temperatures, they may not achieve the same low emission levels as when they are functioning correctly. This can lead to increased smoke and pollutants in the atmosphere, defeating the purpose of the appliance's design.

While other options present potential considerations, they do not capture the core operational challenge associated with non-catalytic appliances. For example, frequent maintenance is not a primary concern unique to non-catalytic systems, nor do they inherently produce more pollutants than catalytic options when functioning correctly. Additionally, the types of fuel used do not typically restrict non-catalytic systems to a specific wood type beyond general recommendations for efficiency and combustion quality.