No, these are not oil filled, it's working on the same principals as a space heater except it's a long, thin design to heat a room faster. If electric rates are high in CA then propane should be on the table, very cheap to run and powerful.The baseboard heater I have is an Intertherm Softheat II, and looks to be this:
Used (normal wear), 62 inch brown hydronic baseboard heater. Works fine. . Make an offer!;offerup.com
As you can see, it has 3 settings, High, Medium and Low (and Off, of course). It has a polarized plug. I've never plugged it in. Is this oil filled? It's heavy, I'm guessing 20lb or more. Big, at 74 inches long.