What must be monitored to ensure food safety when using gas-fired water heaters?

Monitoring back-drift is crucial when using gas-fired water heaters because it refers to the phenomenon where flue gases can potentially flow back into the area instead of being expelled outside. This can lead to the risk of carbon monoxide exposure, which is harmful to health. Ensuring that back-drift does not occur is essential for maintaining a safe environment in any facility handling food.

Temperature levels, while important for food safety, focus on the food itself rather than the functioning of the water heater. Water quality is significant as well but typically relates to the safety and suitability of the water for consumption or cooking rather than the operation of the water heater. Gas levels are also vital for ensuring the appliances work properly and safely, but they are not as directly linked to food safety as monitoring back-drift. Thus, careful attention to back-drift is required to protect both staff and customers in food service environments.