Gas Hot Water Boiler. Perform a tune-up and cleaning to help ensure reliable and safe operation. Inspect for cracks & deterioration of Heat Exchanger. Check and clean Burners, brush and vacuumed-ok Check and clean thermocouple and pilot Assembly-ok Check Safety Controls-ok Check electrical wiring and components-ok Check GVD-Damper-ok Check water feeder-ok Check back flow prevent-ok Check expansion tank-ok Check relive valve-ok Check Gas valve & Gas Line-ok Check Combustion Air, Flue pipe-ok Check Temperatures & Water pressure settings; Performance-ok Check and run Thermostats-okay Check circulation pumps-ok Inspected water heater. Check for water leak-no leakage at this time. Check gas valve and gas Line-ok Check and flush water tank un till water comes clear-okay Water condition- a little bit rusty. Ran water heater, operating well at this moment. Run system, check radiators, all of them getting hot, left system operating well at this moment. No issues at this moment.. View visu