Quick check
OK, plug in a lamp or something on the same circuit as your heater. turn on the lamp. Does it dim when you plug in the heater, and get bright again when heater is unplugged? I know, not fancy, but works for me
Also, after you run it for a while, open hood, the engine should feel warmer to the touch than anything else in the engine bay.
Was your coolant gauge was not even popping a little bit off of the Cold mark?
You should see something with 400 Watts for 1.5 hours... Same size EBH as mine, on a bigger engine than yours. Hmmm
Also, make sure EBH is UNPLUGGED prior to starting engine.
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