Why use hepex instead of aquapex?
Hepex allows the use of cast iron piping. This includes the low loss header and the black piping and the cheaper pump. If a stainless low loss header was readily available, it would be possible to pipe the manifold in copper and use a brass circulator pump, thereby eliminating the need for the hepex. However, even then, we would still use hepex in case some future plumber replaced the circulator with a non-brass one. This would be likely to happen since the brass ones are 5 times the cost and not typically stocked in the back of a service technicians truck.
