Decide what will actually be removed
An electric firebox fitted to a suitable masonry opening is a different project from removing a framed-in gas appliance. Obtain the old unit's model and installation record. Ask who will determine which parts of the venting can remain, who is responsible for safely retiring the gas connection and which areas must be opened to do that work. Leave all gas and electrical disconnection to qualified trades.
Draw the electrical supply and heated-air path
Electric products can have different plug-in or hardwired configurations and may have more than one operating mode. Use the selected model's installation information. Have the electrician identify a suitable supply and connection location; a nearby outlet on a shared circuit does not itself establish suitability. Verify which edges discharge air and which surfaces must remain unobstructed when the finish is installed.
Compare the built project, not just the firebox
Ask for the change to the wall opening, electrical work, old gas and vent treatment, finish patch and access to the new unit as separate scope lines. Request the proposed finish plane on a section drawing. If the new firebox can be removed only by breaking finished tile, ask about alternatives before approving fabrication or ordering the appliance.
