Cut out and removed an old hydrotherm natural gas boiler. Supplied and installed a new natural gas 4 section Peerless boiler. Roughed in and installed a new spiral vent with extrol tank and service valve. Roughed in a new circulator with a return service valve. Wired in the controls and thermostat. Re- roughed the gas line. Filled up the boiler and checked for leaks. Purged all the water lines and heating zones. Fired up the boiler and allowed it to reach temperature. Everything is running as it should. Bled the old cast iron radiators. Paid in full.