Tekmar 315 tN4 Wiring Center Six Zone Valves The tekmarNet 4 Wiring Center 315 is designed to provide a zoning solution for heating systems. It can be used in applications ranging from baseboard zones, to remote manifolds for radiant heating. This product provides power for up to six tekmarNet 4 thermostats, and up to six 24 V (ac) zones valve outputs, as well as providing an end switch closure to enable an external device such as a boiler. A zone group pump relay is also available to switch a pump.