Heaters are a common household appliance used to provide warmth and comfort in cold weather. Ovens (5 letters) are a type of heater that uses electricity or gas to heat food. FUELS (5 letters) are the materials used to generate heat, such as wood, coal, oil, or natural gas. Rods (4 letters) are metal rods that are heated up to provide warmth. GATS (4 letters) are a type of heater that use infrared radiation to warm up a room. Etnas (5 letters) are a type of heater that use convection to circulate warm air throughout a room. Boilers (7 letters) are a type of heater that use hot water or steam to heat a home.