Red Seal Gasfitter — Class A Practice Exam

What role does combustion efficiency play in selecting a gas appliance?

1. It affects the appliance's warranty

2. It determines how much gas is needed to produce a given amount of heat

3. It influences the cost of installation

4. It dictates the color of the flame

The correct answer is: It determines how much gas is needed to produce a given amount of heat

Combustion efficiency is a critical factor in selecting a gas appliance because it directly determines how effectively an appliance converts gas into usable heat. Appliances with higher combustion efficiency require less gas to produce the same amount of heat compared to those with lower efficiency. This has practical implications for operating costs and energy conservation, making it a key consideration during selection. When an appliance operates at high combustion efficiency, less fuel is wasted, and more of the input energy contributes directly to heating. This maximizes the heating output while minimizing gas consumption, leading to greater overall efficiency and reduced energy bills. While aspects like warranty and installation costs can be influenced by the choice of appliance, they are not directly tied to combustion efficiency. Similarly, the flame color can be indicative of combustion quality but does not reflect the efficiency of heat production or gas usage in the same way that combustion efficiency does.