This store is dedicated to products for integrating your (gas condensing) boiler, heat pump, thermostat, solar or mixer module from a Bosch-owned brand like Bosch, Nefit, Buderus, Junkers, Sieger, Worcester, elm.leblanc or iVT via MQTT, a Restful HTTP API or even Modbus TCP into your home automation system like Home Assistant, Domoticz, Loxone or OpenHab.
Integration into f.i. Home Assistant is just a few clicks, and it really takes about 5 minutes. And then you get dozens or sometimes more than 100 entities available to you.

All via your local network without any cloud service or subscription. There are absolutely no fees, no online services that eventually discontinue, no user tracking, no secret API calls to the outside, no required or optional data collection, fully open source firmware, absolutely nothing that tries to get your data or money. Privacy 10 of 10.

With an EMS Gateway you can read out almost every parameter and f.i. set the temperature directly from your home automation system.
The EMS Gateway provides an easy, full access link between your home automation and your EMS heating system. Advanced use cases made much easier than before. You can even let the heat pump heat up the boiler at times when electricity is cheap or your solar panels have surplus of solar power. All with a few plugins and automations from within f.i. Home Assistant.

Boiler and heat pump compatibility

With a few exceptions, almost all Bosch brand or Bosch-owned subsidiary brand boilers from the last 20 years or so use the same EMS bus interface to connect thermostats, solar/mixer modules etc to the boiler/heat pump.
Depending on the brand and the protocol version, the bus is called EMS, EMS+, EMS2, ‘2-wire bus’ and Heatronic 3.
Bosch brands include Bosch, Buderus, Nefit, Junkers, Worcester, Sieger, iVT and elm.leblanc.
For heat pumps it does not matter if it is an air to water or brine heatpump, a hybrid or all-electric nor does it matter if its a split model or a Monoblock. As long as it has any version of the EMS (or Heatronic3) bus it will be compatible.
(iVT has a long history of building heat pumps, older ones do not use the EMS bus so verify it before purchase.)

Check our big compatibility list HERE. If you are still unsure whether your device is supported after reading the compatibility page, just send us an email via the contact form.

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EMS Bus Wi-Fi Gateway

Got a new shiny heat pump or a new or existing gas boiler on your wall and you have no idea what it is actually doing?
An EMS Bus Gateway will tell you exactly that. And it can also set parameters on the fly.

An EMS Bus Gateway is a plug and play device neatly packed in a small enclosure that fits into your hand. Just plug in the device to the service jack on the boiler or heat pump with the EMS service cable and stick it to the side or inside. No additional cables are needed and everything is powered from the service jack itself.
The current model is the EMS Gateway E32 V2 which provide both wireless and a wired networking interface.

You can try out the entire EMS-ESP demo web interface online here: https://demo.emsesp.org/
(User and password is ‘admin’.)

EMS bus interface boards

We also offer a general EMS bus to TTL serial interface board which can interface the EMS bus with an Arduino, ESP8266, Raspberry Pi etc. Sold all over Europe and beyond, this interface board is the tried and tested method to play with the EMS bus that works for basically everyone.

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We accept almost all major payment options and ship to most countries.

Highlighted EMS products