Rinnai gas heaters, including tankless water heaters and space heating units, require regular professional servicing to maintain optimal operational efficiency, safety, and longevity. Manufacturers strongly recommend scheduling an annual maintenance checkup with a qualified, licensed technician to inspect internal components, clean burners, check gas pressure, and ensure proper venting. For tankless water heaters specifically, routine flushing of the heat exchanger to remove mineral scale and sediment buildup is crucial, especially in geographic regions with hard water, as neglected buildup can restrict water flow, trigger error codes, and cause premature component failure. Routine servicing not only preserves the unit's energy efficiency and manufacturer warranty coverage but also ensures safe operation by mitigating potential gas leaks or carbon monoxide risks within the home.