What size (1/2″ or 3/4″ or 1″) and type (PEXa PEXb PEXc) would you use if you had a 3 Family in Brooklyn and you wanted to redo the heating hot water pipe runs to pex?

Have a look at the rating tables for most finned-tube baseboards sold in North America, and chances are, you’ll see a footnote under the table that reads something like this: “Ratings are based on ...