I have a Primary/Secondary configuration. The primary loop is about 20 feet of 1 1/4" B.P. with fittings,powered by continuous running Taco 007 pump. The two secondaries are 1 1/4" pex connected to the Primary through closely spaced tees. These secondary loops, round trip, are about 160 feet in length. The secondaries use Grundfos 15-58 pumps that are activated only when there is a call for heat. When there is no call for heat the idle secondary will experience ghost flows. I don't know how much waste is being created here. I don't know what rate the ghost flow is in gpm. However, if the temp starts out at 180 F, it returns at about 120 F during ghost flow. Any ideas as to get ride of these flows? Do you think that maybe the Taco 007 is causing too much fplow in the primary? Do you think weighted flow checks in the secondaries may help? Anything? Anybody experiencing similar problems with Primary/Secondary configs?