I am guessing then that the cheapo oil filled have very little oil in them. I only have experience of a decent one (Dimplex I think) and it was very heavy, very slow to heat up.
If I am right about very little oil then they are just acting as a standard electric rad and the supposed benefits are being oil filled are negated.
If I am right about very little oil then they are just acting as a standard electric rad and the supposed benefits are being oil filled are negated.