Temro brand Lower rad hose heater bought at Canadian Tire last winter in her 85' model. I'll pay more attention this winter as my car still has the original in block style block heater to compare to. May not be a fair comparison if it is the original 26 year old block heater in mine.
I am fairly certain that her block heater would actually make the temp. guage rise just a hair on the guage, I'll check that again this winter and maybe post a pic of it. That was a bit of a cinch for me to like this lower rad hose heater better.