# Rinnai Central vs MachBackflow

The clearest difference is review sentiment: MachBackflow at 100% against Rinnai Central's 9%. MachBackflow also leads on rating (5.0 vs 1.6). Rinnai Central's advantage is in-app purchases (none vs 3) and ratings volume (396 vs 2). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. MachBackflow sells 3 one-off in-app purchases. Rinnai Central asks for nothing beyond the download.

MachBackflow holds the better App Store score, 5.0 against 1.6. That said, the two scores are not equally well evidenced: Rinnai Central has 396 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 9% of Rinnai Central's written reviews are positive against 100% of MachBackflow's.

Rinnai Central ships an update monthly, MachBackflow every 2 months. The most recent releases landed on October 27, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Rinnai Central | MachBackflow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (396 ratings)](https://appshunter.io/ios/app/rinnai-central/id6444321202/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/machbackflow/id6448785820/reviews)** |
| Number of ratings | **396** | 2 |
| Positive reviews | 9.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 79 MB | 18 MB |
| Requires iOS | **15.4.1** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Rinnai America Corp](https://appshunter.io/developer/1045235922) | [WTM Solutions, LLC](https://appshunter.io/developer/1673242880) |

## What reviewers say

### Rinnai Central

[App page](https://appshunter.io/ios/app/rinnai-central/id6444321202)

This app connects Rinnai tankless water heater owners to their devices for temperature control and scheduling. Professional installers can use it to register appliances, perform service, access documentation, and order parts.

**Highlights:** Adjust water temperature, Schedule hot water, Activate recirculation, Register appliances, Perform remote service, Access documentation, Order replacement parts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Works great
- 🚀 Much improved
- 🚀 Fantastic
- 🚀 Working perfectly now

**What reviewers complain about**

- 🐛 Doesn't work at all
- 🐛 Bug in 4.3.0
- 🐛 Awful. Just terrible
- 🐛 Lousy App
- 🐛 Rinnai does not care

**Reported bugs**

- Control failed is still happening in latest version
- Login screen freezes
- Incompatible with older devices

**Requested features**

- Add device through Bluetooth missing
- Dark mode option
- Advanced analytics dashboard


### MachBackflow

[App page](https://appshunter.io/ios/app/machbackflow/id6448785820)

This app streamlines backflow prevention assembly testing by capturing real-time pressure readings or allowing manual entry. It automatically generates accurate reports and manages all your tests efficiently from the field.

**Highlights:** Real-time pressure capture, Supports all assembly types and procedures, Autofill property and assembly information, Accurate, error-free PDF reports, Cloud synchronization, Powerful search and filters

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Credits 10 | $24.99 | one-time |
| Credits 100 | $174.99 | one-time |
| Credits 250 | $299.99 | one-time |


## Frequently asked questions

### Is Rinnai Central free?

Rinnai Central is free to download, with no in-app purchases.

### Is MachBackflow free?

MachBackflow is free to download, with in-app purchases available.

### Which has better reviews, Rinnai Central or MachBackflow?

MachBackflow is rated higher. Rinnai Central averages 1.6 out of 5 from 396 ratings, while MachBackflow averages 5.0 from 2 ratings.

### Do Rinnai Central or MachBackflow have ads?

Neither Rinnai Central nor MachBackflow shows ads.

### Which is updated more often, Rinnai Central or MachBackflow?

Rinnai Central ships an update monthly, and MachBackflow every 2 months. Most recently, Rinnai Central was updated on October 27, 2026 and MachBackflow on September 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*