R. Barnett
Since we changed over to the Duratherm, I’ve had zero pump and valve failures in more than a year and a half. The heat exchangers aren’t clogging as they did with Calflo, and the sediment in the tank is minimal. We used to have to roto-rooter the heater zones due to clogging, this hasn’t been a problem since we switched. Actually, the heat transfer appears to be the best it’s ever been.