Gas fireplaces burn gas to provide the source of their fuel. These models work by being connected to a dedicated gas supply, then either battery power or an electrical supply to power the ignition system, which is used to start the flames, when required.
Whether or not your fireplace will need a chimney depends on the specific gas fireplace model that you choose.
Simply put, the majority of gas fireplaces need a chimney. This is because the fireplace needs to be ventilated, and the gas that it produces must be allowed to escape. But, because they don’t produce heavy smoke (which is produced by models that burn wood), you won’t need a class 1 brick chimney. For most standard gas fireplaces, a class 2 prefabricated chimney is usually required.