I'm not an expert but i've been boning up on comparisons on the various sites so when i have the cash i will be making well informed purchases.
The BI extreme seems to outperform most other radiators including some beastly sized ones. HOWEVER, i have not seen a comparison of the Leviathon.
As an example the manufacturer rates the BI extreme (aprox 5.5" x 5.5") at 3134 btu/hr, while the much larger dual 120 fan BI II (aprox 6"x 10") at only 2800 btu/hr.
Maybe my conclusions so far are incorrect but it is looking like as in many things in life size isn't the determining factor as to which is best. Heh, heh.
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