Have a look at the rating tables for most finned-tube baseboard sold in North America and chances are you’ll see a footnote under the table that reads something like this: “Ratings are based on active fin length and include 15% heating effect factor.”
Polyethylene raised temperature-type materials have been used successfully in domestic hot and cold water piping systems for more than 20 years, and in application areas such as radiant underfloor heating and radiator connections, states a Dow Chemical report.