Gas fireplace. Dazzling flames and easy operation Are you looking for heat and, at the same time, easy and convenient use? Then a RAIS gas stove may be just the thing for you: Just use the remote control or app to light a cosy fire in the fireplace. Turn the heat up or down as needed. You can choose between a free-standing and a built-in gas fireplace. The gas fireplaces operate on bottled gas, natural gas or city gas.