炉 - hearth, furnace, kiln

fireplace; hearth; stove

nuclear reactor core

atomic reactor; nuclear reactor

blast furnace

smelting furnace; blast furnace

cooking stove; burner (gas, electric, etc.); range; cooktop; hob

closing of the fireplace in a Zen temple (first day of the 2nd month)

coke oven

first lighting of the hearth in a Zen temple (first day of the 10th or 11th month)

crucible furnace

closing of the winter hearth

fireplace used in springtime