# Bell & Gossett - SystemSyzer > HVAC piping system design calculator for friction loss, velocity, and valve settings. (iPhone/iPad app by Xylem Inc..) - Source: https://appshunter.io/ios/app/bell-and-gossett-systemsyzer/id491524114 (this page in markdown: same URL + `.md`) - Developer: [Xylem Inc.](https://appshunter.io/developer/582035368) - Category: Reference, Productivity - Price: Free - Rating: 3.00/5 from 7 App Store ratings · 28 written reviews indexed - Age rating: 4+ - Requires: iOS 15.6 · 5 MB - Languages: American English - Released: 2012-01-06 - Data updated: 2026-08-23 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/bell-and-gossett-systemsyzer/id491524114/reviews.md ## What is Bell & Gossett? System Syzer is an HVAC tool that helps with piping system design. The application is based on the original plastic wheel calculator by designed by Gil Carlson of Bell & Gossett. It was first introduced in 1963 and has since been distributed to well over a hundred thousand engineers and tradesmen. The tool is made up several different calculators. There is a calculator for friction loss and velocity through pipe based on your fluid conditions. Use it to determine the relationship between fluid temperature, system flow and heat/cooling load. There is a Cv tool that can help in multiple ways. We have also bundled the Circuit Setter® / Triple Duty Valve calculator that is very handy for balance contractors. Use it during design to help predetermine valve settings and out in the field to determine flow through the valves based on pressure drop readings. ## Key features - Friction loss and velocity calculator - Heat/cooling load calculation - Cv tool - Circuit Setter/Triple Duty Valve calculator - Fluid temperature and flow rate analysis ## Recent user reviews (10 of 28) All indexed reviews: https://appshunter.io/ios/app/bell-and-gossett-systemsyzer/id491524114/reviews.md ### 4/5 — Handy for field personnel *2024-01-08, version 2.1.0* This app is something I have all of my field personnel download onto their phone. Helps eliminate pipe sizing questions and provides basic pressure drop calculation assistance. ### 1/5 — Miscalculates flow rates for circuit setters sometimes *2023-01-05, version 2.1.0* Depending on if you reset the values each time correctly this app will give you a completely wrong answer based on the printed charts. Also even when it does seem to calculate correctly, there is still some degree of discrepancy with the printed charts. It has been this way for years, and I finally decided it is time to stop using the app altogether for circuit setter balancing. ### 4/5 — iOS 14.5 Incompatibility *2021-05-10, version 2.0.2* This app worked great until I updated my iPhone operating system to iOS version 14.5. I am waiting for the app web developer to fix the bug so I can once again use it. ### 1/5 — DO NOT TRUST THIS APP!!! *2020-11-18, version 2.0.2* I have been doing air and water balance for 26 years. Accuracy is critical if you are a water or air balance professional. We use meters that cost thousands of dollars each. I love innovation, when it actually works.... I would give this app negative stars if possible! I have exclusively used the hand wheel chart when balancing water flow on circuit setters. I saw this app about three years ago, downloaded it and was using it for a little bit. I noticed enormous discrepancies between the GPM’s that were reported on the app and the hand wheel chart. The original issue was, when the degree setting was set to zero, you would get a bogus GPM reading no matter what valve size you were using when you input a pressure differential. I contacted the B&G parts distribution company Dawson and informed them of the problem. Dawson responded wonderfully and contacted the software designer of the app and had the issue resolved. Dawson was so thankful that they sent me a free sweater. Good business. After using the app again, a new issue was discovered. This new issue is very serious and can cause the app to report a GPM reading that is completely different than what it actually is by an extreme amount. I contacted the Dawson company and reported the issue and this time the response was different, they did not seem that interested in trying to have the issue corrected. Not sure why they had a lack of concern. It is for this reason that I am not going to report what the actual issue is and I am doing this in hopes that somebody who actually cares will read this and reach out & contact me from either Dawson or the development group so it gets fixed. The app is a good idea, but it’s no more than that for now until things are fixed. Those of you that use the app can probably figure out what the bug in the software is yourself & I HIGHLY RECOMMEND THAT YOU DOUBLE CHECK YOUR GPM READING AGAINST THE WHEEL CHART FOR EVERY MEASUREMENT WHICH DEFEATS THE PURPOSE OF USING THE APP ALTOGETHER!!!! ### 5/5 — B&G wheel on hand *2020-10-07, version 2.0.2* Love this handy app! I am a NEBB BCP / TAB that works for a large mechanical contractor. I have used this app for years to communicate the GPM flushing requirements, troubleshoot issues with systems, and pre balance hydronic loops. ### 1/5 — Inaccurate compared to B&G class materials *2019-02-12, version 2.0.2* App needs work. Compared to other modern apps the interface is old slow and lacks sophistication. For example, fields must be reentered often, and auto populate with values that must be backspaces to removed. ### 4/5 — Quick & handy *2016-09-11, version 2.0.0* Love this app for quick onsite calculations the only drawback is there is no tab for PEX pipe in the flow calculator, kind of odd the would have PVC pipe (which I've never seen used in a heating application) but not the most commonly used heating pipe. ### 3/5 — P.Eng *2016-05-20, version 2.0.0* Using metric flow and inputting m3/hr the app gives incorrect velocity and pressure drop ### 1/5 — Circuit setter reading incorrect. *2015-11-13, version 2.0.0* After the recent update. Previous version device and current version device side by side give very different results. ### 3/5 — Has calculation errors *2015-11-06, version 2.0.0* The Reynolds Number does not appear to calculate correctly for "Other" liquid definitions with user input viscosity and SG. Otherwise, this is a useful rough estimating tool. ## Frequently asked questions about Bell & Gossett ### What does the SystemSyzer app do? SystemSyzer is an HVAC tool designed to assist with piping system design. It provides several calculators to help determine friction loss, velocity through pipes, and heat/cooling loads based on fluid conditions, temperature, and system flow. ### What are the key features of SystemSyzer? Key features include a friction loss and velocity calculator, a Cv tool, and a bundled Circuit Setter® / Triple Duty Valve calculator. These tools help in determining fluid conditions, system flow, heat/cooling loads, and valve settings for balancing contractors. ### Is SystemSyzer free to use? Yes, the application is available for free. There are no in-app purchases or advertisements mentioned, indicating a completely free user experience. ### Who is the target audience for this app? This app is intended for engineers, tradesmen, and balancing contractors who work with HVAC piping systems. It is based on a classic tool distributed to these professionals for decades. ### How can I use the valve calculator feature? The Circuit Setter® / Triple Duty Valve calculator can be used during the design phase to predetermine valve settings. It can also be used in the field to determine the flow rate through valves based on measured pressure drop readings. ## Version history (last 5 releases) ### 2.1.1 — 2025-04-29 • Added PEX pipe to Flow Pressure Drop. • Fixed Circuit Setter bug causing the Flow to mis-calculate if the Setting is set before the Head Loss. ### 2.1.0 — 2021-05-15 • Updated for the latest iOS version ### 2.0.2 — 2018-03-17 • Fix Circuit Setter bug where the "Settings" value would not reset to 0 when tapping the reset button. ### 2.0.1 — 2017-11-30 • Update CV's used with the Circuit Setter calculator. • Fix bug where Velocity in the Flow Pressure Drop calculator was always shown as FT/SEC even when set to metric. ### 2.0.0 — 2015-10-13 Supporting all iPhone screen sizes. Updated for iOS 9. iPad multitasking support. ## Apps similar to Bell & Gossett | App | Rating | Price | Category | | --- | --- | --- | --- | | [Weldbend Field Reference App](https://appshunter.io/ios/app/weldbend-field-reference-app/id563044323) | 3.1 (36) | Free | Reference | | [Copeland Mobile](https://appshunter.io/ios/app/copeland-mobile/id789715706) | 4.8 (5,160) | Free | Reference | | [P-T Calculator](https://appshunter.io/ios/app/p-t-calculator/id1252176525) | 4.8 (51) | Free | Reference | | [HVACR Check & Charge](https://appshunter.io/ios/app/hvacr-check-and-charge/id574809181) | 4.8 (17,119) | Free | Reference | | [Copeland PT Pro](https://appshunter.io/ios/app/copeland-pt-pro/id465298520) | 3.3 (7) | Free | Reference | ## More apps by Xylem Inc. - [Bell & Gossett Mobile Catalog](https://appshunter.io/ios/app/bell-and-gossett-mobile-catalog/id575228713) - [Goulds Water Technology Catalog](https://appshunter.io/ios/app/goulds-water-technology-catalog/id646809177) - [Flygt MyConnect](https://appshunter.io/ios/app/flygt-myconnect/id694995277) - [Goulds Prof Dealer Assoc GPDA](https://appshunter.io/ios/app/goulds-prof-dealer-assoc-gpda/id791062698) - [AqWiFi](https://appshunter.io/ios/app/aqwifi/id1150465114) All apps by Xylem Inc.: https://appshunter.io/developer/582035368 ## Related topics [system syzer](https://appshunter.io/ios/topics/system-syzer) · [pipe sizing](https://appshunter.io/ios/topics/pipe-sizing) · [xylem](https://appshunter.io/ios/topics/xylem) · [water flow calculators](https://appshunter.io/ios/topics/water-flow-calculators) · [imi hytools](https://appshunter.io/ios/topics/imi-hytools) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*