{"id":499,"date":"2017-12-20T13:29:01","date_gmt":"2017-12-20T18:29:01","guid":{"rendered":"https:\/\/circuitsolver.com\/?page_id=499"},"modified":"2026-04-10T16:04:21","modified_gmt":"2026-04-10T20:04:21","slug":"csu","status":"publish","type":"page","link":"https:\/\/circuitsolver.com\/plumbing-products\/csu\/","title":{"rendered":"CSU"},"content":{"rendered":"

CircuitSolver Union (CSU)<\/span><\/h1>\n
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\"CircuitSolverCircuitSolver\u00ae domestic hot water (DHW) temperature balancing valve automatically balances a DHW recirculation system in a fraction of the time required by traditional manual balancing methods.<\/p>\n

The CircuitSolver\u00ae Union<\/a> features a union with an optional check valve built into the body of the CircuitSolver\u00ae to reduce the number of system components installed and minimize potential leak points.<\/p>\n

The stainless-steel union features an integrated O-ring for a leak-free seal, and the valve\u2019s effortless installation and hands-off operation make it a good fit for any DHWS design.<\/p>\n

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How It Works:<\/strong><\/span><\/h3>\n<\/div>\n

Install a CircuitSolver\u00ae at the end of each branch or riser downstream of the last fixture, and the system balances itself. The Thermoloid\u00ae blend wax thermal actuator at the heart of the CircuitSolver\u00ae monitors the water temperature in the line. It will automatically modulate the valve open or close in response to changing temperatures to maintain a specified temperature at the end of each branch.<\/p>\n

This automatic and continuous response to temperature variation enables each hot water branch to quickly and consistently direct hot water flow to where it is needed without any manual balancing processes.<\/p>\n

The valve will never fully close, allowing a small flow bypass to the return to avoid dead-heading the recirculation pump. The limited flow to your return line will reduce system wear, electricity, and water usage and improve overall system operation.<\/p>\n