The tekmarNet (R) 4 Zone Manager 336 is designed to provide a zoning solution for heating systems. It can be used in applications ranging from baseboard zones, to radiant heating zones. This product energizes up to 4 zone pumps. It is capable of providing power for up to 4 tekmarNet (R) 4 or stand alone thermostats and energizing their respective 115 V (ac) zones, as well as providing a Zone Group Pump (powered end switch) contact to enable an external device such as a primary secondary loop pump.