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rule of thumb for runtal versus slantfin
I'm looking at hydronic baseboard heat for new construction. Runtal is much more expensive per BTU than Slantfin but Runtal is mainly radiative while Slantfin mainly convective. I understand that you're more comfortable with radiative heat (which mainly heats you) at lower temps than needed for convective heat (which heats the air and then the air heats you).
Is there a rule of thumb that says something like "if you need X feet of Slantfin you'd only need Y feet of Runtal"?
Also, is Runtal quieter (less ticking) than Slantfin? Thanks!