Electro Pak Heating ??

Hello all -
I was recently browsing some real estate ads, and saw something called "Electro Pak" heating.
See picture #18 at this URL: http://www.flexmls.com/share/Md4K/1760-ADAMS-AVE-Lewisburg-PA-17837
How does this rate in terms of cost, efficiency, etc.?
This is the only home I've ever seen equipped with one.
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