Those of you who've been installing hydronic radiant heating systems during the past few years have no doubt heard about, if not used, injection mixing for water temperature control. Judging by the schematics and installation photos I've seen, this method of water temperature control has grabbed a sizable share of the market in recent years.
But how many of you state-of-the-art techies used it 10 years ago? I know I didn't. I hadn't even heard of injection mixing back then. When I first saw it, the concept looked completely foreign to the familiar piping of a three-way or four-way mixing valve. I was somewhat skeptical of this "new" mixing method (largely due to my own lack of understanding).