The TT20RS Heat storage model is covered with soapstone and with the additional soapstone modules this specific model has you will achieve the maximum heat storage that accumulates and then emits an incredible amount of heat at one and the same time.
The advantage of soapstone, in general, is that it is a material that absorbs the heat from the stove slowly while, at the same time, emitting the very same heat long after the flames have gone out. Thus, the heat emitted from the stove is more evenly distributed and you can enjoy it for a longer period.
A unique feature of the TT20RS is that you can still feel the effect of the soapstone for up to 13 hours* after the last firing up.
The plinth stone, which you can see, is primarily a design element since it does not get hot.