A heater has an effect on animal Mood (which is different than Friendship) during the Winter when an animal is inside a barn or coop past 6PM, and the animal has 150 mood or above. Only a single heater is required to have an effect, additional heaters provide no additional benefit.
If the animal is able to enter a building with a heater without being trapped outside, they will gain 10 mood every 10 in-game minutes past 6PM, up to the maximum value of 255, or until the Farmer goes to sleep.
|Hoes||Hoe • Copper Hoe • Steel Hoe • Gold Hoe • Iridium Hoe|
|Pickaxes||Pickaxe • Copper Pickaxe • Steel Pickaxe • Gold Pickaxe • Iridium Pickaxe|
|Axes||Axe • Copper Axe • Steel Axe • Gold Axe • Iridium Axe|
|Watering Cans||Watering Can • Copper Watering Can • Steel Watering Can • Gold Watering Can • Iridium Watering Can|
|Fishing||Bamboo Pole • Fiberglass Rod • Iridium Rod • Crab Pot|
|Other||Scythe • Heater • Incubator • Milk Pail • Shears • Copper Pan • Hay Hopper|