What issue arises from using a fire pot that is too large in a converted furnace or boiler?

Using a fire pot that is too large in a converted furnace or boiler leads to poor efficiency for several reasons. When the fire pot is oversized, the combustion process may not occur at the optimal conditions required for effective heat generation. An oversized fire pot can result in insufficient mixing of air and fuel, leading to incomplete combustion. This incomplete combustion not only reduces the heat output but also means that more fuel is consumed than necessary, resulting in wasted energy. As a consequence, the overall efficiency of the system diminishes, impacting both the performance and operational costs.

An additional drawback of poor efficiency is that the system may struggle to reach the desired setpoint temperature, further compounding energy consumption issues. Ensuring that the fire pot is appropriately sized is essential for maintaining optimal performance and efficiency in heating appliances.