Install a CaleffiZ-one zone valve together with a ZVR Z-one relay and both qualify for the company’s industry-exclusive 5-year warranty. The Z-one valves are used to automatically shut off flow or redirect hot and chilled water in hydronic heating and cooling systems and are UL-listed for plenum installations. The ZVR series of controls is used for zoning up to six zone valves (model-dependent) along with a system pump, secondary pump and primary pump. Caleffi 5-year warranty