Grundfos has introduced three new residential zone controls that are loaded with features that assure easy, trouble-free operation of zoned hydronic heating systems. Models include single, three, and four expandable to six zone configurations. The controls offer high resolution LED display for system status and zone function. They also priority and freeze protection options, provide multi-panel linking, a 2-wire with one 3-wire thermostat capability, automatic reset PTC fuse on system 24 VAC, a high capacity 25VA rated transformer, multiple knockouts and separate terminals for cold start or tankless coil boilers. A key advantage is that only one service relay is required for all models.The non-networked zone controls also are 100 percent factory tested, come with a three-year warranty and are UL873 and Canada/CSA approved.