Products are listed by the style of your water heater (traditional tanks style water heater or energy efficient tankless water heaters) and by your plumbing layout (dedicated return line or dead end lines).
If you are like most of us and are not sure how your plumbing is laid out you can take a look at our plumbing diagrams or you can give us a call at (619) 665-2077 and we will help you out.