When checking for spillage, what is the desired outcome?

The desired outcome when checking for spillage is that the appliance combustion gases vent up the chimney. This indicates that the combustion gases are being effectively and correctly expelled from the appliance to the outside environment, which is crucial for safe operation. Proper venting of combustion gases prevents harmful gases, such as carbon monoxide, from entering the living space.

A successful spillage test demonstrates that the appliance is functioning as intended, ensuring that all combustion byproducts are directed outside rather than leaking back into the appliance area or the living space. This is essential for maintaining safety standards and protecting occupants from potential health hazards that can arise from gas leaks or spillage.

While operating quietly, producing no visible combustion products, and ensuring stability within the combustion appliance zone (CAZ) are important aspects of appliance function, they do not specifically address the critical need for proper venting of combustion gases, which is the key goal of the spillage check.