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Verify the insulation replacement kit matches the boiler model and unpack parts carefully, checking for damage.
Turn off electrical power supply and close the manual gas shut off valve to the unit before proceeding.
Turn unit power off, allow to cool, shut off gas supply, and remove the front jacket panel.
Disconnect wires from gas valve, blower, igniter, and remove air inlet elbow and gas supply piping.
Unbolt the blower from the mounting plate, discard old gaskets, and remove the blower/venturi/gas pipe assembly.
Install burner, gasket, and screws onto the new mounting plate, ensuring correct orientation and torque.
Carefully reinsert the burner assembly into the heat exchanger, aligning all components correctly.
Hand tighten and then wrench-tighten the mounting nuts to secure the assembly, avoiding over-tightening.
Reinstall igniter, sightglass, gaskets, blower, and reconnect all wires and gas piping.
Turn on gas supply, check for leaks using a bubble test, and then turn unit power on.