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He-pex tubing is a term that refers to Pex that has an oxygen barrier. It looks just like regular Pex that is used for domestic water systems, only it will not allow oxygen to permeate the tube. In a closed loop boiler system, the same water constantly rotates through many bare iron components. This is not a problem because the rust immediately consumes the oxygen and does not continue to eat away at the components. Pex has become very common in water based heating. Regular Pex is often used because it is less expensive and looks identical.

It was a simple service call at the end of the day today, but  I found something really neat that I wanted to share. I have never seen an air filter this old that was this advanced. Of course, modern air filters like this are more effective, but for its age it is really impressive. I love finding things like this.