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They have it wired so that you can select one or all three taps, one using the entire heat strip, and 2/3 then 1/3, you can even use 120v. and a 30 amp set-up. Well thought out.
Yes, a residential unit is simple, just a heat insert into the air handler, 4 or 5 screws, and it slides out. Their system needs to have about 5 or 6" more clearance that we have, so they use a sheet-metal spacer. It is a good system. One could make a similar set-up with off the shelf parts for 1/2 or less the cost.
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