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That heater element is a purely resistive load, i.e. it has a power factor pF of 1.0. The meter on your MEP (well actually the entire MEP) is designed for a system with a pF of 0.8. If you divide the 75% indicated by 0.8, you come up with around 94% load. 46 amps divided by 52 (nameplate data...

I built a load bank using a plastic 55 gal drum, 10 Kw worth of water heater elements, and a garden hose when I first got the beast up and running. Wasn't the safest thing in the world (actually not safe at all) so I won't be doing that again. I may make an air cooled one out of dryer elements...

I do have a clamp-on meter, just couldn't find it today. I have checked it in the past though and found the installed gauge to be pretty accurate.

In the Southeast corner near Foxwoods.

Loaded up the -803A today to blow the dust out of it. Running 2 - 2.5T heat pumps, well pump, refrigerator, pellet stove, and lighting only got me up to 50% load (55% when the well pump cycled on). Adding in the range hood (2 - 175 watt heat lamps, 2 - 600 cfm blowers, and two halogen spots) got...