SmartHeat4U
Here you will find answers to the most frequently asked questions about using the SmartHeat4U app.
The following ports must be open to ensure secure communication between the heating system, the server and the app:
For external control (MQTT):
Port: 1883 (TCP)
Port: 8883 (TCP)
An installation brings the thermostats together in one room. This way you can manage different properties, e.g. a house, an office or a holiday apartment.
You can create a maximum of 4 installations in the app.
The temperature sensor measures the room temperature, and if it drops (as with an open window), the heating system switches off.
If the temperature in a room drops by more than 5°C within a period of 30 minutes, the heating is switched off for a maximum of 30 minutes (waiting time). If the temperature rises by more than 1°C within this 30-minute period, or if the waiting time has expired, the heating is switched back on (return to normal operation). After this, a 30-minute „lockout“ period takes effect. After the expiry of this lock-out period, the detection process is restarted.
Click on „Select validity“ and choose the desired validity.
You can limit the maximum adjustable temperature. This also limits the maximum temperature that can be set directly on the thermostat.
Follow the steps below to limit the maximum room temperature:
Contact us at support@smartheat4u.com
This feature allows users to share their installations with other users. By sharing, you can give other people access to control your heating without having to share your account login details. You can assign individual read and write permissions to other users.
Important: The invitation can only be sent to email addresses that are already registered in the SmartHeat4U app. This means that the person with whom you want to share the installation must first install the app and register with an email address.
To share an installation, simply go to the settings in the app and select the „Shared Access“ option. Enter the email address of the user you want to share the installation with. Then select the desired installation and click „Send.“ The other user will then receive a notification in the app that you have shared an installation with them.
Yes, you can revoke shared access at any time. Simply go to the settings in the app and select the „Shared Access“ option. Click on the trash can icon next to the installation where you want to revoke the sharing. This removes the access for the other user and they can no longer access the installation.
The new user has the option to perform various actions in the shared installation, including:
Each of these options can be set up separately. You can therefore precisely control which actions the other users can perform.
Account sharing is recommended if you want to share the installation with other people, but at the same time want to limit editing capabilities, for example with employees or vacation rental residents. In such cases, account sharing is a recommended option. However, if you are thinking about sharing the installation with people who live with you, it might be a better solution to share your account access information with them so that they can log in directly on their devices.
Today (17.04.2026) we are not available by phone.
Please use our Contact form or send us your request by email to vertrieb@thermotec.ag.
We will get back to you as soon as possible.