# Rinnai Central vs TernaID

The clearest difference is update cadence: Rinnai Central at monthly against TernaID's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Rinnai Central ships an update monthly, TernaID every 3 months. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Rinnai Central | TernaID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.6 (396 ratings)](https://appshunter.io/ios/app/rinnai-central/id6444321202/reviews)** | — |
| Number of ratings | **396** | — |
| Positive reviews | 9.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | Free | — |
| Size | 79 MB | 20 MB |
| Requires iOS | **15.4.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rinnai America Corp](https://appshunter.io/developer/1045235922) | [Doquima Corp](https://appshunter.io/developer/1806934025) |

## 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


### TernaID

[App page](https://appshunter.io/ios/app/ternaid/id6744294298)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rinnai Central free?

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

### Is TernaID free?

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

### Do Rinnai Central or TernaID have ads?

Neither Rinnai Central nor TernaID shows ads.

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

Rinnai Central ships an update monthly, and TernaID every 3 months. Most recently, Rinnai Central was updated on October 27, 2026 and TernaID on October 25, 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.*