warmer(n = noun.artifact) heater - device that heats water or supplies warmth to a room;
is a kind of device
has particulars: brasier, brazier, convector, defroster, deicer, demister, gas heater, heating pad, hot pad, kerosene heater, kerosine heater, oil heater, oilstove, radiator, solar heater, space heater, stove, hot-water heater, hot-water tank, water heater
Derived form verb warm2
One who, or that which, warms. [1913 Webster]