In general, a heater should be serviced annually by a professional HVAC technician in order to ensure it is functioning at its peak efficiency. Not only does this keep the heater operating safely and soundly as a long-term investment, but it also helps prevent expensive repairs or replacements down the road.
A qualified technician should perform any necessary calibrations and tune-ups that are required for a particular heating system, as well as check for signs of wear or potential damage. Regular servicing is especially important for older heaters or those installed in particularly difficult locations, such as commercial areas or homes with pets or heavy airborne particles. So make sure to include annual heater servicing when creating your home maintenance calendar!