I use to buy a lot of those heaters when I was
in the fuel lab(we heated fuel tanks for testing)
.. they work well.. you should buy a controller
for it also otherwise they get way to hot.. pretty
sure most of them are made by 1 or two companies
and everyone puts their name on them
EDIT
If you just plug in straight to the wall plug
you can blow a 20A breaker.. they do draw fair
amount.. thats why a controller should be used
EDIT
After reading the wattage and the size of the
pads you wont need any controller... I am use
to much larger units