86 years ago William Wesley Hicks from San Francisco invented the first electrical baseboard heater. The first patent for an electric baseboard heater was patent number 1,664,171, filed in 1925 and issued Mar 27, 1928:
You can see the whole patent here and here
Mr. Hicks was well ahead of his time and actually successfully made a design that replaced the actual wood baseboards and hid the heater behind it. That is something that people are still trying to invent today. Hence the birth of the name “Baseboard Heater” because the heater was also the baseboards!