A Thermal Stone can be heated up by placing it next to a Fire Pit, Magma, Scaled Furnace, Dwarf Star or a burning object. It can absorb heat regardless of whether it is on the ground, in a Chest, or in the player's inventory. Different heat sources affect the maximum degree the stone can attain. Also, a Red Hot Thermal Stone can emit enough light to ward off Charlie.
While carried in any Backpack, including the Insulated Pack, Thermal Stones can still affect the player's temperature.
Every time the Thermal Stone goes from Freezing White or Glowing Red to Gray, the Thermal Stone loses 12.5% of its durability. It can, however, be repaired with a Sewing Kit or Trusty Tape, and one use of which will fully repair it.
Blue and gray Thermal Stones can be given to the Antlion to appease it, delaying its rage by 4 days. When offered white, yellow or red Thermal Stones, it will become enraged.
A Thermal Stone acts as a heat source with an internal temperature between -20° and +90°. With the thermal stone in the inventory, the player's own body will attempt to reach a temperature given by the formula:
T_b = (T_a + 2.1*T_h)/3.1
where T_b is the target body temperature, T_a is the ambient temperature, and T_h is the temperature of the thermal stone. This formula means that both T_a and T_b are considered, only T_h is given 2.1 times the importance.
If the stone is on the ground instead, the target body temperature is instead given by:
T_b = (T_a + T_h)/2
which is simply the average (midpoint) between the ambient temperature and the thermal stone's temperature.
The temperature of a heated thermal Stone drops at a rate determined by 120 insulation, which is 1 degree every 5 seconds. This insulation is only used for determining the stone's own temperature loss and does not affect the player.
Temperature Stages
The stage of the thermal stone is determined relative to the ambient temperature and each stage emits a fixed temperature:
Stage
Internal Temperature
more than 30° below ambient temperature
between 30° and 10° below ambient temperature
between 10° below and 10° above ambient temperature
The Loyal Metamorphosed Flame skin was awarded for watching 6 hours of Don't Starve Together on Twitch from May 9, 2019 to July 25, 2019, and from January 7, 2021 to January 14, 2021. It is also available in the Klei Rewards shop for 1,200 Klei points.
Woven - Elegant Charmed Heatstone A warm glow radiates from deep within the crystal. See ingame
Loyal The Metamorphosed Flame A vibrant flame extracted in crystallized form from a passionate soul. See ingame
Tips
The crafting recipe will accept pickaxes of any durability, so it is advised to use pickaxes that are at 3% durability to avoid wasting their use.
Having more than one Thermal Stone, one carried with the player, the other one kept charged (near heat source for warmth, or in an Ice Box for cool) allows quick switching, instead of waiting for a single one to charge.
It is advised to keep cool Thermal Stones in Ice Box and hot Thermal Stones near Scaled Furnace, so players don't need to worry about losing durability of the Thermal Stones.
Multiple Scaled Furnaces can heat up the Thermal Stone more than just one Scaled Furnace. 4 Scaled Furnaces can reach the maximum degree of the Stone.
The best way to maximize the heat from Thermal Stone is to place it near Magma or a burning object until it glows brightly. This will provide the maximum heat with the longest duration.
The Thermal Stone was renamed from Heat Stone to best fit its functionality in the Reign of Giants DLC, since it can also be used to cool the player.
In the final release of the DLC, Where there's a Wilson..., the Thermal Stone received a new, cleaner asset for when it is at minimum temperature. Also in this update, the minimum temperature for the Thermal Stone was set to 25 in the Summer, solving the previous issue where holding a frozen Thermal Stone would cause freezing damage in the Summer.
Bugs
In the console edition of Don't Starve Together, Thermal Stones sometimes may not heat up, even when placed next to a fire.
Gallery
A Thermal Stone near a fire.
A comparison between a Thermal Stone's light radius and a Crock Pot's light radius.
Thermal Stones heating up by a roaring fire.
The Thermal Stone lighting the surrounding area in Don't Starve.
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