In the copper series, there's also an "economical" line:
M05-050, M05-100, M10-080, M10-160, M14-120 and M14-240.
Do take the time to download the Lytron catalog, to check out the specs: that last unit is 14 inches high, and 24 inches wide (2 inch thick).
Watch out for the flow restrictions, and the heat dissipation. Multiple rads in parallel might be in order here.
Warning: the catalog is a 5.5 MB file!
Personally, I'll stick with heatercores
