# OJ Microline® UWG4

> Remote thermostat control for heating systems, enabling schedule adjustments and energy monitoring. (iPhone/iPad app by OJ ELECTRONICS AS.)

- Source: https://appshunter.io/ios/app/oj-microline-uwg4/id1046778776 (this page in markdown: same URL + `.md`)
- Developer: [OJ ELECTRONICS AS](https://appshunter.io/developer/1326069502)
- Category: Lifestyle, Utilities
- Price: Free
- Rating: 2.10/5 from 26 App Store ratings · 26 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 13 MB
- Languages: American English, French (France), European Spanish
- Released: 2015-10-15
- Data updated: 2026-07-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/oj-microline-uwg4/id1046778776/reviews.md

## What is OJ Microline® UWG4?

The OJ Microline® UWG4 app lets you make the most of your OJ Microline® UWG4 Touch thermostats: use the app to remote control your home heating system from any location. 

Like the thermostats themselves, the app is entirely intuitive and easy to handle – making it simpler than ever to ensure maximum savings on your heating bill while still enjoying a warm welcome every time you step into your home. 

• View and set temperatures
• View your heating schedule – and change it
• Set your heating system to vacation mode
• View your energy log 

View and set temperatures: You can instantly see the current temperature in all your rooms and locations fitted with OJ Microline® UWG4 Touch thermostats. And make any adjustments you want. Want your beach house heated for your weekend visit? Need the guest bedroom warmed up for an unexpected visitor? Or your bathroom ready for a nice, long soak when you get home? No problem. 

View and change your heating schedule: One of the key benefits of your OJ Microline® Touch thermostat is its schedule function, where the thermostat automatically adjusts heating levels to match your usual timetable. However, sometimes you need a bit of flexibility, and this app lets you override the schedule to adjust temperatures as you wish – from any location including your home.

1. Fast-forward to the next scheduled change (e.g. to turn up the heat because you’re coming home early)
2. Make instant temporary adjustments  (for example, you might want to turn down the heat everywhere for a good spring cleaning where every window is open)

Set your heating system to vacation mode: At times your heating schedule will need adjusting because you’re going away on vacation or on business. With the OJ Microline® UWG4 app you can plan those adjustments whenever you have a spare moment – and time them to take effect when you need them to. That way, you can walk out the door safe in the knowledge that you won’t waste money on heating an empty house – and that you’ll still get a warm welcome on your return. 

View your energy log: The app lets you monitor your heating system’s current and past energy consumption at any time and from any location.

The app works with the WLAN version of OJ Microline® Touch thermostats (UWG4)

• View and change your heating schedule 
• View and change heating settings
• View and set indoor temperatures
• Access multiple OJ Microline® Touch thermostats 
• Access multiple locations fitted with OJ Microline® Touch thermostats
• Set units to Standard US or Metric
• Choose between Fahrenheit or Celsius
• 24-hour or 12-hour clock

## Key features

- Remote temperature control
- Heating schedule management
- Vacation mode activation
- Energy consumption monitoring
- Access multiple thermostats
- Set US or Metric units

## Recent user reviews (10 of 26)

All indexed reviews: https://appshunter.io/ios/app/oj-microline-uwg4/id1046778776/reviews.md

### 1/5 — UWG4 Support Terminated

*2026-05-24, version 1.8.0*

Super annoying I spent close to $500 on two thermostats and they were effectively bricked to manual thermostats. Spoke to a VP in the US whom I accessed on LinkedIn who attempted to get me help, but was completely ignored. If you have a UWG and you want remote access, you have to buy something else, the UWG4 is dead!

### 1/5 — Worthless App

*2026-02-10, version 1.8.0*

Very user unfriendly. Does not stay on schedule.

### 5/5 — No landscape mode

*2026-01-25, version 1.8.0*

App will not rotate to landscape mode

### 1/5 — Incredibly disappointing

*2025-12-24, version 1.8.0*

I spent a lot of money on this WiFi thermostat because I wanted to be able to control my thermostat remotely. The interface is primitive and buggy. I try to enter certain times for the heating schedule and the app overrides my choices. There’s supposed to be a way to connect the thermostat with Alexa via the app, but that is not possible. There should be a way to turn off the floor heater when you’re away, but there’s not.

### 1/5 — App is Horrible

*2025-11-26, version 1.8.0*

Was Logged Out and there isn’t a way to retrieve or reset my password.

### 1/5 — App literally doesn’t work.

*2025-11-23, version 1.8.0*

I get a connection error every time. App is unusable.

### 1/5 — Can’t login

*2025-05-26*

Can’t even login now. This app keeps getting worse and worse.

### 1/5 — WiFi connection

*2025-01-14, version 1.6*

The thermostat no longer connects to the internet.

### 1/5 — Won’t work on ioad

*2024-12-09, version 1.6*

Useless and confusing..nice thermostat but WiFi feature is of no value

### 2/5 — Limited, clunky app. You

*2024-11-25, version 1.6*

It doesn’t have a weekly input if you want to change the schedule for the whole week .  You have to change every day.

## Frequently asked questions about OJ Microline® UWG4

### What does the OJ Microline UWG4 app do?

The app allows you to remotely control your OJ Microline® UWG4 Touch thermostats. You can view and set temperatures, modify your heating schedule, activate vacation mode, and monitor your energy consumption from any location.

### What are the key features of this app?

Key features include the ability to view and set current indoor temperatures, adjust your heating schedule on the fly, set your system to vacation mode to save energy, and view your heating system's energy log. It also supports access to multiple thermostats and locations.

### Is this app free to use?

Based on the provided information, the app is available for free. There are no mentions of subscription fees, in-app purchases, or advertisements.

### What thermostats are compatible with this app?

This app is designed to work with the WLAN version of OJ Microline® Touch thermostats, specifically the UWG4 model. Ensure you have a compatible thermostat to utilize the app's features.

### How can this app help me save money on heating?

The app helps you save money by allowing precise control over your heating. You can easily set your system to vacation mode when you're away, adjust schedules to avoid heating an empty house, and monitor energy consumption to identify potential savings.

## Version history (last 5 releases)

### 1.8.0 — 2025-09-15

Performance and Security Update

### 1.6.2 — 2025-01-27

Schedule button bugfix

### 1.6 — 2023-05-26

Minor bug fixes

### 1.5 — 2022-12-23

Minor bug fixes

### 1.4 — 2022-08-11

Minor bug fixes

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## More apps by OJ ELECTRONICS AS

- [OJ MicroLine® OWD5](https://appshunter.io/ios/app/oj-microline-owd5/id1326069503)
- [SWATT®](https://appshunter.io/ios/app/swatt/id1334128169)
- [Microtemp WiFi MWD5](https://appshunter.io/ios/app/microtemp-wifi-mwd5/id1374320540)
- [OJ Air Service tool](https://appshunter.io/ios/app/oj-air-service-tool/id1374343463)
- [ARDEX HEAT](https://appshunter.io/ios/app/ardex-heat/id1408605027)

All apps by OJ ELECTRONICS AS: https://appshunter.io/developer/1326069502

## Related topics

[oj electronics](https://appshunter.io/ios/topics/oj-electronics) · [oj microline® uwg4](https://appshunter.io/ios/topics/oj-microline-uwg4) · [oj electronics as](https://appshunter.io/ios/topics/oj-electronics-as) · [uwg](https://appshunter.io/ios/topics/uwg)

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*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 2026-07-24.*