is an electric fireplace furniture does it have to be removed upon sale of property

That's really har dot answer without more information.  Somethign like the removal of this fireplace will depend on the terms of the contract negotiated with the buyer.  You can sell a house "as is" and leave everything there, or the buyer can require that certain things be done ot the property.  If you do not want to be responsible for removing it, make it part of the listing agreement that it stays or that seller takes no responsibility for the removal.