"Andy Burns" wrote in message
...
What could you do to make an electric space heater less than 38%
efficient?

Let most of the heat escape or be released when heat isnt required
and is not wanted like with the original entirely passive storage
heaters when there is no one in the house because they are working
during the day and the heat is gone by the time they get home
after work and need heat then in a not very well insulated house.