1 Gas Hot Water Boiler: Slant Finn Cast-iron 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 tubes and heat exchanger- ok, vacuumed-ok Check and clean flame sensor/flame rod and ignition Assembly-ok Spark igniter. Check Safety Controls-ok Check electrical wiring and components-ok Check Gas valve & Gas Line-ok Check Combustion Air & Exhaust-ok Check Temperatures & Water pressure settings; 20psi Performance-ok Check and run Thermostats operating. Replace thermostat batteries provided by customer. Check zoning operation- run zoning- x2 zone valve operating with x1 thermostat. Check circulation pumps-ok amps and voltage check. Check water feeder, low water cut off, relief valve and expansion tanks. Check for water leak no leakage at this moment. Run and monitored for good operations. All zones are fine supply and return lines getting hot. Perform check for HWH. Check for water lea