Sizing US/CA vs Rheem
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sizing US/CA
This utility app helps installers determine the correct size of flexible gas piping for their projects. It calculates the appropriate pipe size based on gas type, tubing length, supply pressure, and flow capacity. Users can also access installation guides and product information.
- Flexible gas pipe sizing
- US and CA location selector
- Automatic value adjustment
- Certification card access
- Installation guide viewer
- Product search
- Direct contact with developer
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Size Gastite® and FlashShield™ flexible gas piping with this convenient and easy-to-use application for the iPhone. This app allows flexible gas pipe installers to determine the appropriate size Gastite pipe recommended for the installation at hand. Based on the project’s gas type, length of tubing run, supply pressure, pressure drop, and flow capacity – the app will calculate the appropriate size Gastite/FlashShield CSST for your application. Features : Includes a location selector for US and CA Scroll wheel automatically adjusts depending on values selected Find your certification card to link a digital version to your device FAQs View the latest Design and Installation Guide Search for Gastite and FlashShield products Contact Page submits questions and requests directly to Gastite The Gastite and FlashShield flexible gas piping systems are designed and warranted to provide sufficient gas volume and pressure for proper appliance performance using the appropriate sizing tables and methods detailed in the Design and Installation Guide and this Mobile Sizing App. Accordingly, the design pressure loss on the Gastite and FlashShield piping system under maximum probable flow conditions, from the point of delivery to the inlet connection of the equipment shall be such that the supply pressure at the equipment is greater than the minimum pressure required for proper equipment operation. Minimum Requirements - iOS version 8
Rheem
This app streamlines HVAC installation and service for contractors. It offers Bluetooth connectivity for system setup and troubleshooting, along with comprehensive support for product information, warranty tracking, and locating resources.
- Bluetooth setup and troubleshooting
- System monitoring and status checks
- Alarm diagnosis and history
- Parts replacement guidance
- Access to manuals and tech sheets
- Warranty tracking and certificate sharing
- Retailer and distributor locator
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We’ve redesigned Rheem for Contractors to offer the industry’s most powerful, intuitive, and easy-to-use app. Whether you’re on a residential service call or installing 40 units at a major site, the free Rheem Contractor app’s Bluetooth® capability – paired with an enabled HVAC system -- makes set-up and troubleshooting simpler than ever. With Rheem for Contractors and eligible air systems, you can easily: Install - Set up systems quickly and easily with the new Bluetooth® setup - Monitor operating parameters from your phone while charging outdoor units - Verify system setup with access to system operating status - Quickly check for alarms Service - Diagnose active alarms and alarm history - Check system operating status - Easy step-by-step parts replacement and system setup The Rheem for Contractors app also offers powerful support for all of our air and water products, with a new Product Technical Support design that is easier to use and more accurate than ever: - Access installation instructions - Search parts lists - Download manuals - View tech sheets - Research consumer literature Track Warranty information - Scan and confirm model and ownership details - Check warranty status and share HVAC systems warranty certificate Locate - Look up retailers - Look up distributors Research - Find up-to-date rebate information - Research financing options - Offer extended warranty - Confirm AHRI information and certification for HVAC systems
Screenshots
Verdict
The clearest difference is rating: Rheem at 4.6 against Sizing US/CA's 3.2. Rheem also leads on ads (none vs shown) and review sentiment (43% vs 11%). Sizing US/CA's advantage is iOS requirement (10.0 vs 16.0). On price, update cadence, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Rheem holds the better App Store score, 4.6 against 3.2. That said, the two scores are not equally well evidenced: Rheem has 1.7K ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 11% of Sizing US/CA's written reviews are positive against 43% of Rheem's.
Sizing US/CA ships an update every 6 weeks, Rheem monthly. Both last shipped on October 16, 2026.
| Parameter | Sizing US/CA | Rheem |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (13 ratings) | 4.6 (1.7K ratings) — better |
| Positive reviews | 11.1% of reviews | 42.9% of reviews — better |
| Number of ratings | 13 | 1.7K — better |
| Update frequency | Every 6 weeks | Monthly — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 10.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 27 MB | 109 MB |
| Age rating | 17+ | 4+ |
| Developer | Gastite Products LLC | Rheem Manufacturing Company |
Customer experience
Sizing US/CA
Rheem
In-app purchases
Sizing US/CA
No in-app purchases
Rheem
No in-app purchases
Questions
Is Sizing US/CA free?
Is Rheem free?
Which has better reviews, Sizing US/CA or Rheem?
Do Sizing US/CA or Rheem have ads?
Which is updated more often, Sizing US/CA or Rheem?
Other comparisons
