Tekmar now offers 2-zone and 3-zone pumps, and 3-zone and 5-zone valves. The newly added switching relays and zone valve controls are compatible with all low-voltage thermostats and offer a variety of benefits. These include unlimited expansion; exercising, which prevents pumps from seizing during the summer; zone priority; and priority override to protect from freezing over the winter months. The switching relays and zone valve controls also send out a RoomResponse signal to automatically adjust boiler temperatures to improve comfort, conserve energy and save money. Tekmar. www.tekmarcontrols.com/products/zoning.html