https://isoterm.ru/product/elektricheskiy-greyushchiy-kamen/elektricheskiy-greyushchiy-kamen-merkuriy/ 

Electric heating stone Mercury is not only distinguished by safety low energy consumption reliability but also brings sophistication to the design of any room. The front panel of the device is made of natural marble.

Electric heating stone Mercury externally is a panel of natural marble which is fixed on the wall and connected to the mains voltage of 220V. Due to the high inertia of the material of the front panel after heating even in the off state the stove will give off heat for several hours. The device is characterized by high fire safety since the heating element is isolated and placed inside the structure.