?Commercial Water Heater Maintenance Water heaters, particularly commercial models, are wonders of modern engineering. So long as preventive maintenance measures are taken, they are, in-general, highly reliable appliances that are not prone to frequent or sudden failures. Water heaters that do not work effectively are costly, inconvenient, and they can be extremely dangerous. For example, inoperable or defective temperature-and-pressure relief valves and thermostats can cause explosions. Explosions can also be due to flammable objects in the vicinity and have been know to cause injury or death resulting from house fires Preventative Maintenance is critical to efficient water heater performance. Operating costs and heater life expectancy both depend on an effective Preventative Maintenance programs. In order to avoid common water heater problems, the following checklist covers all the major items that contribute to reduced efficiencies, higher operating costs, and premature failures. Each item should be examined regularly for proper operation. Ensuring these items are in good working order will prevent the chance of sudden or frequent water heater malfunctions. If any defects, wear, or poor operation is detected, simple repairs or replacement should be made to correct the problem. Burners Combustion Chamber Damper Calcium (lime) buildup Gas Valve(s) Gas Supply Gas Leaks High Limit Cut-off Ignition System Pressure Relief Valve(s) Venting Recirculation Pump(s) Thermostat(s) Anode Rods Wiring Electrical Component(s) Water Shut-off Valves Heat Exchanger Storage Tank(s) Water Heater(s) Therefore, it is imperative that a Preventative Maintenance program be in effect at all times, and all scheduled services are performed to ensure efficient operation and avoid hazardous complications.