What advantage does this drainback system have over a glazed copper glycol, direct or passive system?
Glazed copper systems have high maintenance because the glycol must be replaced at least every five years. Furthermore, breakdown of glycol can cause acidic conditions and eat through your copper plumbing or your collector. Lastly, glycols systems require costly overheat protection. The Fafco system has none of these problems. Direct systems can freeze and pop when the temperature dips below 40 degrees at night. Passive systems can freeze and generally do not perform as well as active systems.
