Programmable Thermostat

The Taco SR506 is a professional-grade 6-zone enhanced switching relay designed for sophisticated hydronic zoning systems in residential and commercial heating applications. This unit features a 120 VAC input transformer and delivers reliable zone control with integrated priority switching capability, making it ideal for multi-zone radiant heating, baseboard heating, and hydronic distribution systems where selective zone activation is required. The SR506 accommodates a maximum combined load of 20 amps, with individual circulator relays rated for 1/3 HP or 6 amps at 120 VAC per zone, providing ample capacity for standard circulator pump applications. The unit includes an isolated end switch rated at 24 VAC with 1 amp capacity and provides 24 VAC Class 2 output for universal thermostat compatibility, ensuring seamless integration with existing control systems. Built with professional installation in mind, the SR506 measures approximately 11.75 to 12.25 inches wide by 7.5 to 8 inches high by 3 inches deep, allowing flexible mounting in electrical panels and equipment closets. The priority switching function enables sophisticated heating strategies by allowing one zone to take precedence when demand conflicts occur, optimizing system efficiency and comfort control. This replacement cartridge circulator pump component is essential for contractors and facility managers maintaining multi-zone hydronic systems. The Taco SR506 delivers the durability and performance expected from industry-leading thermal comfort solutions, backed by decades of hydronic system expertise.