What might affect the performance of an FVIR water heater?

The performance of a FVIR (Flame-Vent Ignition Resistant) water heater is significantly impacted by screen blockages due to lint and dust. FVIR water heaters are specially designed with a sealed combustion system that utilizes a screen at the bottom to prevent the entry of flammable vapors. If this screen becomes obstructed by lint, dust, or other debris, it can restrict airflow, leading to improper combustion and potentially dangerous operational conditions. Furthermore, blockages could result in inadequate venting of combustion gases, increasing the risk of overheating or even fire hazards. Therefore, maintaining clear screens is crucial for the safe and efficient operation of FVIR water heaters.

While the type of water used, the height of the tank, and the material of the tank may have their own implications for water heater performance, they do not specifically impact the combustion process and safety in the manner that screen blockages do.