Choosing between products

I offer several products to interface with the EMS bus: Gateways and interface boards.

Interface boards are only a pure hardware board that translate the EMS bus signal to a UART serial port signal and vice versa. You need to connect a microcontroller to these boards and install or write your own software to interact with the EMS bus.

Gateways are a complete plug and play package that you can connect to the bus via just one cable or two wires and they provide an easy to use web, MQTT or HTTP interface to communicate with your home automation.

Choosing between a Gateway and an interface board

If you want to have all your boiler and thermostat data into your home automation like Home Assistant, Domoticz etc with only one cable and in only a few clicks, then pick a Gateway. If you like to play around with electronics, solder stuff and mess arount with Dupont wires, or you want it a bit cheaper but less nice, you can choose one of the interface boards.

Like mentioned above the interface boards are just a piece of hardware. It comes with no microcontroller or software.

Choosing between Gateway models

At this moment there are three Gateway models available:

  • Gateway Premium II (P2)
  • Gateway S32
  • Gateway S32 LR (Long Range)
  • expected Q2 2021: Gateway E32 (Ethernet version)

The Gateway S32 is the next generation model based on the ESP32 microcontroller. The S32 Long Range has an external antenne which gives the wifi reception a nice boost.
The Gateway Premium II is based on the older ESP8266 and still available at a lower price point and will be supported for the foreseable future (limited to bug, maintenance fixes and EMS device database updates).

Gateway S32 (Standard edition)

The Gateway S32 (S=Standard edition) is the latest Gateway model based on the ESP32 microcontroller. It support all the software features of the Gateway Premium II but as a single downside you cannot power it from the bus. Only via the service jack or a 12V DC adapter.

Features:

  • EMS-ESP firmware version V3 and up
  • Plug-and-play connection to the EMS bus with one cable
  • Connects to the EMS bus via the service jack or the EMS/thermostat wires
  • 2.4GHz Wi-Fi connectivity
  • Complete responsive webinterface
  • Firmware updateable via the webinterface
  • Configured for Home Assistant
  • Now supports the Home Assistant MQTT Discovery protocol
  • Plugin for Domoticz
  • MQTT and Restful API for other interfaces like OpenHAB and Loxone
  • Telnet console
  • Optional DS18B20 temperature sensors
  • Supports all EMS heating circuits
  • Support large EMS systems with many EMS devices simultaneously
  • Support for EMS, EMS+, Heatronic 3 etc.
  • Can be powered via the service jack or a 12V DC adapter.

The Gateway S32 has a lot of room for additional features.

If you are a power user or have a newer boiler with EMS+/EMS2 or a heatpump, then get the Gateway S32. If you want a device that is future proof as much as possible, get the Gateway S32. If you have an EMS1.0 boiler with no or just one thermostat, and not more than two EMS devices on the bus, the Gateway Premium II is still a good option.

Gateway S32 LR (Long Range edition)

The Gateway S32 LR Long Range is exactly the same product as the S32 but it has been fitted with an external antenna. This improves wifi reception by about 5 to 10 dB so if the Gateway is placed far away from the acces point or router this can make all the difference.

Gateway E32 (Ethernet edition)

A Gateway with Ethernet is under development and expected around end of Q2 2021.
You can visit the preliminairy product page HERE and fill out your email. As soon as the E32 is available, you will get an email notification.

Gateway Premium II (P2)

The Gateway Premium II is the all time bestseller EMS product that’s been available and in use with many many users since early 2019.
It connects via the jack or screw terminal and can also be powered by the bus itself in many cases.
It’s based on the ESP8266 microcontroller. With EMS-ESP software version 2.2 it’s packed to the brim with features.
Meanwhile it has reached it’s limits though.
There will still be software updates in the future, but they will only be limited to bug and maintenance fixes and EMS device database updates. Because it’s full, there is no room for any new features. But the current featureset is still great! If you just want to get your boiler data into your home automation the Gateway Premium II will still do that perfectly for years to come.

Features:

  • EMS-ESP firmware version V2.2
  • Plug-and-play connection to the EMS bus with one cable
  • Connects to the EMS bus via the service jack or the EMS/thermostat wires
  • 2.4GHz Wi-Fi connectivity
  • Complete responsive webinterface
  • Firmware updateable via the webinterface
  • Configured for Home Assistant
  • Now supports the Home Assistant MQTT Discovery protocol
  • Plugin for Domoticz
  • MQTT and Restful API for other interfaces like OpenHAB and Loxone
  • Telnet console
  • Optional DS18B20 temperature sensors
  • Supports all EMS heating circuits
  • Support large EMS systems with many EMS devices simultaneously
  • Support for EMS, EMS+, Heatronic 3 etc.
  • Can be powered via the service jack, the EMS bus itself or via a USB adapter.

The Gateway Premium II is still a good choice for those who want bus power and for those with older EMS 1.0 boilers. If you have a newer EMS+/EMS2 boiler like the GB192i, 9000i or you have a heatpump, or you have multiple heating circuits and multiple mixer modules, then you are better off with the new Gateway S32. Also if you are a ‘power user’ who want to use multiple protocols (MQTT+HTTP+Telnet) at the same time you should get the new Gateway S32.