Performed annual maintenance on 14-year-old Burnham natural gas boiler with hydronic radiant heating system. Inspection revealed good condition of piping, expansion tank, heat exchanger, pressure relief valve, and backflow prevention. Identified one zone valve motor that opens but fails to make its end switch for boiler activation. Combustion analysis showed safe operation with minor heat exchanger seal deterioration (1 ppm leakage) requiring future monitoring.