CircuitSolver Union Assembly (CSUA)
CircuitSolver® valves balance a domestic hot water recirculation system in a fraction of the time and dynamically modulate flow to sustain a set water temperature by automatically balancing the system as conditions change.
The CircuitSolver® Union Assembly (CSUA) features a union with an optional check valve built into the body of the CircuitSolver® and isolation ball valves on either side to reduce the number of system components installed, minimizing potential leak points. The CSUA valve has an integrated O-ring in the union and is factory assembled for a leak-free seal.
These thermostatic valves eliminate the need for costly labor, repeated callbacks, and manual “guesstimate” calculations of system projected usage. Instead, you have a dynamic solution that responds to the needs of the building and constantly modulates flow to maintain a set temperature.
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How It Works:
The CircuitSolver® Union Assembly valve is installed in a domestic hot water system just before the return at the end of each branch or riser. The valve uses our unique Thermoloid wax thermal actuator to modulate between open and closed in response to temperature changes to maintain a specified temperature in each line.
The valve will be in its closed* position when the water temperature in the supply branch is above the valve’s set-point and only open, establishing flow when it drops below the set-point. This automatic response to temperature allows the balancing valve to adjust dynamically to the varied usage rates in a domestic hot water system (DHWS) throughout the day.
*Note: 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.
Valve Components:
The CircuitSolver Union Assembly valve comprises 100% stainless-steel components, a high-quality O-ring, two isolation ball valves, and an optional check valve.
| ITEM | DESCRIPTION | MATERIAL |
| 1 | Valve Body w/ Union Threads | 300 series stainless steel |
| 2 | Union Nut | 300 series stainless steel |
| 3 | Female Threaded Inset | 300 series stainless steel |
| 4 | Plug | 300 series stainless steel |
| 5 | Operating Spring | 300 series stainless steel |
| 6 | Thermal Actuator | 300 series stainless steel |
| 7 | O-Ring | Buna-N |
| 8 | Check Valve (Optional) | Glass Filled Noryl |
| 9 | Ball Valve, ½” MxF | Brass Lead-Free |
Typical Applications:
The CircuitSolver® Union Assembly can be used in any building with a domestic hot water recirculation system to ensure it’s thermally balanced and readily available hot water at each fixture. Used in commercial buildings of all sizes and DHWS’ with varying complexity, installations often include hospitals, schools, hotels, high-rises, and multi-family apartment buildings.
To see CircuitSolver® installations in your area, visit our installations page.
CircuitSolver® thermostatic balancing valves can also balance the return flow between the master mixing valve and the water heater. To learn more about this application, go to the Balancing a DHWS Return with CircuitSolver page.
Benefits:
- Automatically and continuously adjusts to balance domestic hot water systems
- Eliminates balancing labor and callbacks
- Direct replacement for manual balancing valves
- Reliable, long-lasting thermal actuators
- Long service life and 3-year warranty
Certifications:
- NSF/ANSI/CAN 61 & 372 Certified
- Lead Free
- Fully compliant with Section 1417(d) of SDWA, the Safe Drinking Water Act
- Supports efforts toward LEED Certification
- Complies with the Buy American Act
Specifications:
- Sizes: 1/2″, 3/4″ & 1″
- Fixed Temperatures:
- 100°F (37.7°C)
- 105°F (40.5°C)
- 110°F (43.3°C)
- 115°F (46.1°C)
- 120°F (48.8°C)
- 125°F (51.6°C)
- 130°F (54.4°C)
- 135°F (57.2°C)
- 140°F (60.0°C)
- Max Working Pressure: 200 PSIG/14 BAR
- Max Working Temperature: 250°F/121°C
CircuitSolver® is a great product. The valves automatically adjust to changing temperatures and pressure drops unlike manual and automatic balancing valves. Plumbing Contractor Production Plus Plumbing in Vista, CA
Using CircuitSolver® makes balancing the system so easy. The valves automatically adjust themselves, so you don’t have to check each valve once installed, and there are never any callbacks for issues. Arturo Hernandez GJM Engineering in Los Angeles, CA
I haven’t come across another product like CircuitSolver®. Once you install the valves you never have to adjust them, unlike manual balancing valves where you have to balance every single valve you install. Richard Parker Plumbing Contractor at Pan-Pacific Mechanical in Fountain Valley, CA
I haven’t come across another product like CircuitSolver®. Once you install them, you never have to adjust them, unlike manual balancing valves where you must balance every single valve you install. Employee – Da Vinci Project for GJM Engineering, Los Angeles, CA
CircuitSolver® is a game changer in balancing DHWS and I would definitely use it as a standard in future projects. Matt Trevino Plumbing Engineer at DBR Engineering in San Antonio, TX
What an awesome little device these guys make. It’s a no-brainer. Andy Crossland Principal Mechanical Engineer at Crossland Engineering LLC in Honolulu, HI
I try to have CircuitSolver® specified on as many jobs as possible due to the simplicity of it. Eric McTee Plumbing Designer at ME Engineering in Golden, CO
Rittenhouse Hill Apartments - We had a very complicated apartment restoration involving 47 risers. CircuitSolver® saved a lot of time, installed easily, used smaller recirculation pumps to save energy & wear, and continues performing well. Ron Miller President at Adelphia Plumbing in Philadelphia, PA
CircuitSolver® makes the initial startup so easy. When we turned it on, the valves balanced the whole system without us having to make any adjustments. We never have any issues when installing them in our projects. Plumbing Contractor Production Plus Plumbing in Vista, CA
CircuitSolver® makes balancing the system so easy. We don’t have to manually set each line or make any adjustments. We have had absolutely no balancing issues since we started up the system. Richard Parker Plumbing Contractor at Pan-Pacific Mechanical in Fountain Valley, CA
I would tell any contractor, building engineer, and mechanical engineer if you are looking at CircuitSolver®, it is simple, it is easy to use, and it works right from the get-go. Chris Watts Plumbing Service Manager at Braconier in Denver, CO
Simply stated, CircuitSolver® valves are easy to install and work very well with no issues to date. They’re efficient and take the time typically required to manually balance systems at the end of the project out of the equation. Christopher Meurer Plumbing Operations Manager at J.C. Cannistraro, LLC in Boston, MA
CircuitSolver® valves are efficient and take the time typically required to manually balance systems at the end of the project out of the equation. We have started up systems in the afternoon to come in the next morning to find hot water perfectly balanced throughout all risers and zones. Christopher Meurer Plumbing Operations Manager at J.C. Cannistraro, LLC in Boston, MA
CircuitSolver® is a great product - I have never used anything like it. Robert Schrieber Maintenance Manager at Embassy Suites in Brunswick, GA
It was taking over a minute and a half to get hot water, and now it’s down to 15-20 seconds…also a huge conservation of water…it was a fairly simply retrofit. Robert Albanese Owners Representative for The Austonian in Austin, TX
When we install CircuitSolver® valves, it corrects the client’s hot water circulation problems, and everything operates as it’s designed. We are going to keep installing them. Jason Putnam Project Manager at Douglas ORR Plumbing in Miami Springs, FL
I recommend CircuitSolver® to anyone who wants to listen; they won’t be disappointed. Once installed, there will be no reason to return to them for maintenance. CircuitSolver® eliminates the amount of work you must do in the field. Joe Sargent Onsite Plumbing Superintendent of W.E. Bowers, for new eCommerce HQ2, Arlington, VA
Right after the installation the general manager went around the building and there was a noticeable difference with quick delivery of hot water. Andy Crossland Principal Mechanical Engineer at Crossland Engineering LLC in Honolulu, HI
The Da Vinci Project - By using CircuitSolver® balancing valves, we were able to save both time and money. The start-up process was much faster by not having to manually adjust each valve. After installation, the system balanced itself and required no maintenance. Arturo Hernandez GJM Engineering in Los Angeles, CA
By eliminating the conventional method of using fixed flow balancing valves and installing CircuitSolver® valves instead we were able to resolve our lack of hot water in some sectors of the hospital issue instantly. André Renaud Building Consultant at Mental Health University Institute of Quebec
CircuitSolver® is a great product - I have never used anything like it. Robert Schrieber Maintenance Manager at Embassy Suites in Brunswick, GA
Before CircuitSolver®, we would have wait times between 5-7 minutes for hot water on the higher floors. Since we have installed CircuitSolver® valves, we are getting hot water when we need it and have not had a single complaint. Robert Schrieber Maintenance Manager at Embassy Suites in Brunswick, GA
Before we installed CircuitSolver®, we would have wait times between 5-7 minutes for hot water on the higher floors. Since we’ve installed CircuitSolver®, we have been getting hot water when needed and have not had a single complaint. It’s a great product; I’ve never used anything like it. Robert Schrieber Maintenance Manager, Embassy Suites in Brunswick, GA
The advantages of the system are an efficiently balanced system, saving time testing and balancing the system, lower utility bills and reduced water usage. Luke Holding Project Engineer at The Beck Group in Dallas, TX
The University of South Florida - On startup of this install, the system automatically balanced itself in under 3 hours, all without manual labor thanks to CircuitSolver®. The plumbers actually went out a did another job, went to breakfast, and when they came back, the system was balanced. Mike Bishop V.P. of Engineering at RGD Consulting Engineers in Jupiter, FL
It usually takes 2-3 plumbers, 2-3 days to balance a system of this size, but by using CircuitSolver® this process was done instantly. Huge savings in terms of time and effort typically devoted to the balancing process. Stephan Thompson Plumbing Contractor at E.M. Duggan Inc. in Canton, MA
We’ve used CircuitSolver®s exclusively now for several years in every application we can. Simply stated, the product is easy to install and works very well with no issues to date. Christopher Meurer Plumbing Operations Manager at J.C. Cannistraro, LLC in Boston, MA
Ordering the assembled CircuitSolvers allowed ICS to use less jobsite manpower and enabled us to install every balancing valve correctly. Time to tap, I have never seen a building so consistently deliver hot water that fast! I’m impressed with the whole system. Ed Parisi Plumbing Design Manager at Industrial Commercial Systems, for LEGOLAND® Castle Hotel, Carlsbad, CA
CircuitSolver®, being that it is an automatic balancing valve, just makes the job of balancing an intricate hot water system that much easier. David Texter Plumbing Engineer at Browne Engineering in Cincinnati, OH
Install it and save yourself the headache; CircuitSolver® is in a league of its own. Adam Podway Project Manager, Gorman-Lavelle Corp, for UH St. John’s Medical Center, Westlake, OH
CircuitSolver® was able to automatically balance the system when engineers could not. Mark Wilmink MarkCo Plumbing in Florence, KY
USC Villages Student Housing - By using CircuitSolver®valves, we saved time and money by not having to balance the system or make any adjustments. It made the process much easier and smoother. Richard Parker Plumbing Contractor at Pan-Pacific Mechanical in Fountain Valley, CA