# Della+ vs Rinnai Central

The clearest difference is rating: Della+ at 3.6 against Rinnai Central's 1.6. Della+ also leads on iOS requirement (13.0 vs 15.4.1). Rinnai Central's advantage is update cadence (monthly vs every 3 months). On price, review sentiment, ratings volume and ads there is nothing between them.

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

Della+ holds the better App Store score, 3.6 against 1.6. Both are backed by a comparable volume of ratings — 435 and 399 respectively. Written reviews split almost evenly too, at 9% and 9% positive.

Della+ ships an update every 3 months, Rinnai Central monthly. The most recent releases landed on October 30, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Della+ | Rinnai Central |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (435 ratings)](https://appshunter.io/ios/app/della-plus/id1590950655/reviews)** | [1.6 (399 ratings)](https://appshunter.io/ios/app/rinnai-central/id6444321202/reviews) |
| Number of ratings | **435** | 399 |
| Positive reviews | **9.4% of reviews** | 9.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | Free |
| Size | 241 MB | 79 MB |
| Requires iOS | **13.0** | 15.4.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Align Inc. (CA)](https://appshunter.io/developer/1590950657) | [Rinnai America Corp](https://appshunter.io/developer/1045235922) |

## What reviewers say

### Della+

[App page](https://appshunter.io/ios/app/della-plus/id1590950655)

Control smart home appliances remotely for optimal comfort and energy efficiency. Adjust settings, automate temperature based on location, and integrate with voice assistants for a seamless living experience.

**Highlights:** Remote appliance control, Smart feature integration, Energy efficiency, Voice assistant compatibility (Alexa, Google Assistant), WiFi connectivity, GeoFence temperature adjustment

**Features:** Apple Watch app

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 👍 Integrated seamlessly with product
- 💡 Connects to other products

**What reviewers complain about**

- 🐛 App doesn't work properly
- 🐛 Can't increase temperature
- 🐛 Connectivity issues
- 🐛 Removed features after update
- 🐛 Confusing interface

**Reported bugs**

- App freezes or becomes unresponsive
- Fails to connect to devices
- Loses saved settings and configurations
- Displays incorrect or inconsistent information

**Requested features**

- Add ability to increase temperature
- Restore removed features
- Improve app stability and reliability
- Enhance user interface and controls
- Add support for more device models


### 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


## Frequently asked questions

### Is Della+ free?

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

### Is Rinnai Central free?

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

### Which has better reviews, Della+ or Rinnai Central?

Della+ is rated higher. Della+ averages 3.6 out of 5 from 435 ratings, while Rinnai Central averages 1.6 from 399 ratings.

### Do Della+ or Rinnai Central have ads?

Neither Della+ nor Rinnai Central shows ads.

### Which is updated more often, Della+ or Rinnai Central?

Della+ ships an update every 3 months, and Rinnai Central monthly. Most recently, Della+ was updated on October 30, 2026 and Rinnai Central on November 3, 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.*