Last Updated: 18 June 2026
Weather compensation is an intelligent heating control method that allows compatible Viessmann boilers to adjust heating flow temperature according to the outside temperature.
Instead of running at a fixed high temperature, the boiler can automatically respond to changing weather conditions, helping improve comfort, efficiency and system performance.
What Is Weather Compensation?
Weather compensation uses an outdoor temperature sensor to monitor the temperature outside the property.
The boiler then uses this information to adjust the heating flow temperature. When the weather is milder, the boiler can run at a lower temperature. When the weather is colder, the boiler increases the flow temperature to maintain comfort inside the property.
How Does It Help?
By matching the heating flow temperature more closely to the actual heat demand, weather compensation can help the heating system operate more efficiently.
For condensing boilers, lower return temperatures can support more efficient condensing operation, particularly during milder weather.
The result can be a more consistent indoor temperature, fewer sharp heating cycles and improved overall comfort.
Potential Benefits
- Helps the boiler respond automatically to changing outdoor temperatures.
- Can improve heating efficiency when correctly installed and commissioned.
- Supports lower flow temperatures during milder weather.
- May improve comfort by reducing temperature swings.
- Can help compatible Viessmann condensing boilers operate more effectively.
- Simple upgrade for many compatible Viessmann heating systems.
Viessmann Weather Compensation Kits
Viessmann weather compensation kits typically include an outdoor temperature sensor designed for use with compatible Viessmann boilers and controls.
The correct kit will depend on the boiler model, control platform and installation arrangement.
Please check the relevant boiler product page, installation instructions or Accessories tab before ordering.
Compatibility
Weather compensation is product and control specific. Not every boiler, control or installation arrangement will use the same sensor or accessory.
Before ordering, please confirm compatibility using the appliance model, serial number, installation manual or advice from a suitably qualified heating professional.
If in doubt, please contact us before ordering and we will help where possible.
Installation & Commissioning
Weather compensation should be installed and commissioned in accordance with Viessmann instructions.
Correct positioning of the outdoor sensor is important. The sensor should normally be installed where it can accurately measure outside temperature without being affected by direct sunlight, heat sources, flues or sheltered locations.
Heating curve settings and system parameters should be configured by a competent installer to suit the property, heat emitters and customer comfort requirements.
For Homeowners
If you are a homeowner, we recommend discussing weather compensation with your heating engineer before ordering.
Your installer can confirm whether your boiler and heating system are suitable and advise whether any additional controls, sensors or commissioning changes are required.
For Installers
Installers should check the relevant Viessmann installation and service instructions before specifying or fitting weather compensation accessories.
Correct setup is important. The full benefit of weather compensation depends on suitable system design, correct sensor placement and appropriate control settings.
Need Help Choosing the Correct Sensor?
If you need help identifying the correct Viessmann weather compensation sensor or accessory, please contact our customer services team with the appliance model and serial number where available.
0333 123 1233
sales@viessmanndirect.co.uk