Words cannot describe how good it feels to wrap yourself into one of these when you’re cold.
I heat my house with just a heatpump but it can’t quite keep up when it gets well below 10 degrees celcius and I’m too cheap to turn on electric radiators. I bought an electric blanket for 22 euros and I just heat that instead. Even just sitting on it makes a huge difference.
That’s not true. That thermal mass takes energy to heat too. Whatever “excess” heat stored in the oil was put there when you turned the radiator on.
For an oil-filled radiator to be cheaper to run than a regular electric one, it’d somehow need to be over 100% efficient - which it isn’t. They’re both resistive heaters that convert 100% of the electricity into heat.