Which tubing is best to use for hydronic heating applications such as baseboard?
For baseboard and other hydronic heating applications you will want to use either oxygen barrier PEX or PEX-AL-PEX tubing (the aluminum core acts an oxygen barrier). In most applications oxygen barrier PEX (such as ThermaPEX or hePEX) will be used. However, PEX-AL-PEX, because of its ability to hold its shape, is often used. Both of these products are able to withstand temperatures up to 200° F. The oxygen barrier will prevent rusting of cast iron components in your system.
