# BT21 — BT21 Bluetooth Control

> BT21 Bluetooth Control (iPhone/iPad app by Thermogroup UK.)

- Source: https://appshunter.io/ios/app/bt21/id1561931603 (this page in markdown: same URL + `.md`)
- Developer: [Thermogroup UK](https://appshunter.io/developer/915777303)
- Category: Lifestyle, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 12.4 · 23 MB
- Languages: English
- Released: 2021-05-05
- Data updated: 2026-05-18
- User reviews in markdown: https://appshunter.io/ios/app/bt21/id1561931603/reviews.md

## What is BT21?

Customise your 7 day heating schedule faster than ever before with the BT21 app. Connect via bluetooth and control all of your thermostat settings quickly and easily. 

Once you've set up one thermostat, copy and paste all of your settings to another thermostat with easy presets.

- Quick and easy heating schedule.
- Copy presets to multiple thermostats.
- View temperature data for the last 7 hours.
- View %heating time for the last 7 days.
- Send remote technical reports.
- Manage temperature limits and calibration.
- Set and manage all thermostat settings.
- Connect to a wireless sensor (sold separately).
- Lockdown mode to prevent tampering.
- Hide unwanted thermostats.
- Switch between heating, snow melting and power limit modes.
- Switch between air, floor and remote sensors.
- Access to online user guides and videos.


## Version history (last 5 releases)

### 2.0.0 — 2024-08-30

Bug fixes

### 1.0.64 — 2023-11-16

Bug fixes

### 1.0.43 — 2023-01-24

Bug fixes

### 1.0.32 — 2021-12-22

Improvements to available settings
Bug fixes

### 1.0.28 — 2021-07-01

Bug fixes

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## More apps by Thermogroup UK

- [My Thermotouch](https://appshunter.io/ios/app/my-thermotouch/id1246802530)
- [ThermoSphere](https://appshunter.io/ios/app/thermosphere/id1435864290)
- [T-MO Control](https://appshunter.io/ios/app/t-mo-control/id6745813087)

All apps by Thermogroup UK: https://appshunter.io/developer/915777303

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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 2026-05-18.*