Final answer:
Gas-fired hot water heaters must be installed by a licensed professional and continuously monitored for safety and efficiency.
Step-by-step explanation:
Gas-fired hot water heaters must be installed by a professional technician or plumber who is licensed and qualified to do so. The installation process should be done following specific guidelines and safety protocols to ensure efficient and safe operation.
Once the installation is complete, gas-fired hot water heaters must be continuously monitored for safety and efficiency. This includes regular maintenance, inspections, and addressing any issues that may arise promptly. Monitoring can help identify potential problems, prevent accidents, and ensure optimal performance of the hot water heater.