Multi IO Box

Make your automated underfloor heating control even smarter and safer with the Homematic IP Multi IO Box. 

Versatile control unit makes your heating system even smarter 

While you long for warming floors in winter, you can't shake the thought of making the heating system even smarter to save energy and money? The control unit Multi IO Box makes your smart heating system even more efficient. The natural talent controls various devices and functions with its two outputs and inputs each. It thus reduces the costs of your heating system and also protects it from mould formation or excessively high temperatures. See for yourself the advantages of the Multi IO Box.

Viele Ausgänge

Multifunctional outputs

The Multi IO Box switches various devices and functions via two outputs: 

  • Circulation pumps of the heating system
  • Circulation pumps for domestic water use
  • Heating boilers
  • Electric radiators
  • Heat pumps for switching heating/cooling mode


Handy mit Auge

Inputs can be combined individually with outputs.

Heating or cooling? You decide
If you would like to cool your floor as well as heat it, supplement the underfloor heating actuator with the separate Multi IO Box control unit. 


A heat pump with heating/cooling mode changeover must be available and the underfloor heating must be prepared for this. The Multi IO Box then controls an existing heat pump with which you can also use the underfloor heating for cooling.

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Einfache Montage 

Mount the Multi IO Box either on the wall or on DIN-hat rails using the screws supplied. 


The DIN-rail adapter (HmIP-DRA) makes mounting on a DIN rail very easy. 

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Multifunctional inputs

Connect various external sensors or devices to the inputs of the Multi IO Box to make your heating system even more efficient: 

  • Condensation sensors minimise the risk of mould formation due to condensation on your pipes in cooling mode 
  • External switch for switching between heating and cooling
  • Time switches for individual control of your heating system
  • Temperature switches protect the floor against excessive temperatures 

Flexible control possibilities

Use the Multi IO Box individually (in stand-alone mode) or as part of your smart home system. 

  • For stand-alone operation, you also need an underfloor heating actuator (e.g. HmIP-FAL230-C6) and wall thermostat (HmIP-WTH-2). The actuator does not necessarily require an access point or the app. You make the settings directly on the wall thermostat.
  • As part of a smart home system and in addition to the Multi IO Box and an underfloor heating actuator, you also need the Homematic IP access point: Operation and setting are simple via the free app. You can expand your smart home flexibly in many areas to suit your needs. 

Your advantages at a glance

Do you want to live more safely, save money and protect the environment, or simply increase your living comfort? There are many good reasons for a Smart Home. Find out more now!

Control heating

Save energy

Use the app

Connect devices together

Homematic IP: Smart living. Simply exciting.

Homematic IP means modern, flexible and secure technology from the European market leader*. Let the advantages of our system win you over, and start living smarter straight away. 

With some smart home providers, you have to make a choice: Do you have everything wired, or do you go fully wireless? Some systems are also hermetically sealed and do not accept devices from other manufacturers. Here at Homematic IP, we have a different approach. We are guided by you!

The Homematic IP app

Configure all the settings for your smart home in the Homematic IP app, and use it to control, regulate and monitor your devices whenever you want – without providing any personal data!
A smart home system is particularly robust, interference-proof and reliable when the devices communicate with each other via wired connections. And data transmission is very fast with cables, too. That all comes together with Homematic IP Wired.

Always here for you and your queries.

Whether you have a question about a product, something isn’t working as you wanted, you’re looking for a specialist partner, or you simply want to give us feedback: we are always here to help.



This is where you’ll find the most important questions and our answers about our smart home solutions.



Have you purchased a Homematic IP product and now have questions about how it works? Our technical support team will be happy to help you.

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You can get Homematic IP products and good advice all over Germany. Find the right dealer near you here.

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