Everything is done pretty quickly and simply. On the cast-iron stove put a tank with a lid, made of galvanized sheet metal, only the bottom of it is made of soft aluminum. The reservoir is filled with ordinary river sand, which, heated from the furnace, holds heat for a long time and heats the room. To ensure that the heat from the heated bottom of the tank penetrates more quickly into the sand, through the entire volume of the reservoir,
As a result of good thermal contact of the plates with the bottom, the sand in the storage tank heats up very quickly. The bottom joint with the reservoir is sealed with asbestos cloth and reinforced with rivets.
The room begins to heat up almost immediately, as the furnace is flooded, and the sand creates a reserve of heat, which gives up both during the furnace and after the burning ceases.