[UpNorth]

I need to get a handle on radiator size and count, and need a package like I had a couple of PCs ago. I think it came free from Slant-Fin, but I don't see it available at their website any longer.

Any leads to anything?

 

[SLSTech]

Sorry not my area - but here are a quick few. hopefully they help

http://www.builditsolar.com/References/Calculators/HeatLoss/HeatLoss.htm
http://www.h-mac.com/heat-load-calculator/heat-load-calculator.php
http://www.acca.org/speedsheet/

 

[beenthere]

Here is an online one at Burnham. Its not real accurate though.
http://www.burnham.com/contractors/heat-loss-calculation

And here is their product specifications, includes their classic rads, and their newer slim line.
http://www.burnham.com/contractors/heat-loss-calculation

And here is their page that takes you to all of their toolbox.
http://www.burnham.com/contractors/toolbox

Good luck.