Room heater app

2023-06-13  –   What size electric heater do I need? Size electric heaters correctly every time

This app allows you to pick a correctly sized electric heater from the options in our range. You can size up to 6 rooms in a property in one go.

Download for Android devices

Read more on the app below or download for Android now!

Download for Android devices

Download for Apple devices

Read more on the app below or download for iOS now!

Download for Apple Devices

Find out more about the app

How it Works

To get started, simply enter the details of your room in the app. You will need to enter the following information:

Room dimensions (length, width, and height)

Age of property (or year when it was last brought in line with building regulations for insulation)

Once you have entered this information, the app will calculate the required heating capacity for your room and provide you with a list of recommended heaters from the STIEBEL ELTRON UK range that meet your needs.


The STIEBEL ELTRON UK range features a wide variety of quality heaters to suit different room sizes and heating requirements. Some of the options that you may be presented with include:

  • Convector heaters
  • Duo convector & radiant heaters
  • Rapid Fan heaters
  • Bathroom radiators 

Each range of heater has its own unique features and benefits, such as energy efficiency, quiet operation, and ease of use. You can browse through the options and select the one that best suits your needs and budget.

Benefits of the App

There are several benefits to using the Room Heater Sizing App:

Accurate sizing: The app calculates the required heating capacity for your room ensuring enough power for rapid heat up times, ensuring that you get the right size heater for your needs.

Wide range of options: The STIEBEL ELTRON UK range offers a wide variety of heaters to suit different room sizes and heating requirements, giving you plenty of options to choose from.

Energy efficiency: The app takes into account the insulation of your room and other factors to recommend heaters that are energy efficient, helping you save money on your heating bills.

Easy to use: The app is user-friendly and easy to navigate, making it simple for you to enter your room details and find the right heater for your needs.


The Room Heater Sizing App is a valuable tool for anyone looking to heat their room efficiently and effectively. By entering your room details, you can get accurate sizing recommendations and browse through a wide range of options from the STIEBEL ELTRON UK range. So why wait? Download the app today and start heating your room in style!

App support

Please email if you have any issues with the app.