A source of warmth can come from a variety of sources. A FIREPLACE, which has nine letters, is a common source of warmth in many homes. Fireplaces are typically fueled by wood, gas, or electricity and provide a cozy atmosphere. Heaters, with six letters, are also a popular source of warmth. These are usually powered by electricity and can be used to heat an entire room. Quilts, with five letters, are another source of warmth. Quilts are often made of thick fabric and filled with batting, providing insulation and warmth.