The tekmarNet 4 Dual Zone Manager 337 is designed to provide a zoning solution for heating systems. It can be used in applications ranging from baseboard zones, to radiant heating manifolds. This product can operate up to 6 zone valves in 2 groups. It is capable of providing power for up to 6 tekmarNet 4 or stand alone thermostats and energizing their respective 24 V (ac) zones, as well as providing two separate Zone Group Pump (powered end switch) contacts to enable an external device such as a manifold pump. Zone Group Pump A is for zones 1-3 and Zone Group Pump B can be activated if zones 4-6 call for heat.