What will be the result if too large a fire pot is used in a converted furnace or boiler?

Using a fire pot that is too large in a converted furnace or boiler can lead to poor efficiency for several reasons. A larger fire pot may result in incomplete combustion, which affects the overall performance of the heating system. When the fire pot is oversized, it can lead to an increase in heat loss and a decrease in the temperature of the combustion gases, preventing optimal heat transfer to the fluids being heated. This inefficiency translates to higher fuel consumption for the same energy output, resulting in greater operational costs.

In contrast, smaller or more appropriately sized fire pots enable more controlled combustion, allowing for a more efficient heating process. Therefore, ensuring the fire pot is correctly sized is crucial for maintaining the efficiency and performance of the system.