This ESP32 based Gateway S32 (Standard Edition V2.0) is the only device you need to add your EMS devices to your home automation system.
Just plug in the device into the service jack on the boiler with the optional jack cable and stick it to the side of the boiler.
If your boiler does not have a service jack, you can also use the EMS/thermostat wires in parallel to the thermostat.
No additional cables are needed and everything is powered from the jack itself or from an external 12V power adapter.
The Gateway connects via WiFi to your home network.
Its all neatly packed in a nice and small enclosure (90x50x24mm) that fits into your hand.
(To make a choice between Gateway models look HERE)
- 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
- V2.0 circuit board based on the Espressif ESP32 with 16MB flash
- 2.4GHz Wi-Fi connectivity
- EMS-ESP firmware V3
- Complete responsive webinterface
- New: English, German, Swedish and Dutch language selection (more to come)
- Firmware upgrade via the webinterface
- Configured for Home Assistant
- Supports the Home Assistant MQTT Discovery protocol
- MQTT Discovery now also works with Domoticz without plugin
- MQTT and Restful API for other interfaces like NodeRED, 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.
Supported EMS device types (See the full list here):
- Heat pumps
- Solar modules
- Mixer modules
- Service jack (with the optional cable)
- 9-12V DC (with the optionally supplied power adapter)
If your boiler has a service jack you do not need the DC power supply, only the jack cable. If your boiler does not have a service jack, or it does but you want to mount the Gateway elsewhere you need the DC power supply.
You can add your own 12V DC power supply later on but I only support the power supplies that can be ordered with the product.
Do not use cheap audio cables for the service jack as they have very thin wires inside. Only use the optional cable below.
On first boot the Gateway will create an access point on which you can login with a browser and make the appropriate settings for your own network. So for this kit you don’t need any soldering or real programming skills. You do however need to properly configure your home automation system. For Home Assistant, Domoticz and OpenHAB the MQTT discovery is available.
It has an additional connector for directly connecting Dallas 1-wire DS18B20 sensors.
The Gateway can be plugged into the service jack of the boiler, or you can connect it to the EMS bus via the thermostat wires instead. In the latter case you need to use the 12V power supply.
Because the Gateway is an ‘always on’ device it contains high quality components like Panasonic and Murata capacitors for maximum longevity of the device.
Included in the kit:
- Fully assembled and tested Gateway S32 (Standard edition)
- Self adhesive strip
- JST ZH cable for connecting external DS18B20 sensors (sensors not included).
- Optional: 3,5mm jack cable for the EMS service jack
- Optional: 2-pole Euro plug power supply with 12VDC output and 5.5mm DC barrel jack connector (center pin positive).
- Optional: wall mount bracket.
For all details about this product look at the extensive EMS Bus Gateway product Wiki.
Please consult the information pages before purchase.
The Gateway comes fully assembled, tested on an actual EMS boiler and loaded with the EMS-ESP firmware.
You can download the manual here.
The current firmware of the Gateway already supports the long list of these EMS devices.
If your device is not listed, it might very well be fully or partially compatible. In case you are missing parameters, you can always open an issue on the firmware repository to get support.
If you have an old Nefit Ecomline boiler or the control panel on your boiler looks like one of THESE, then your boiler is not EMS based but iRT. The Gateway will not work on iRT boilers without a modification nor is there any support in the firmware.
Steffen Pohl (verified owner) –
It did not work right out of the box, the installed fw did not reconnect after a wlan loss. Took me some time to get guided to a beta which solved the problem as far as I can say now. I have not done a comprehensive test so far, connecting a bunch of DS18B20 will be the next step and afterwards controlling the boiler. I am quite optimistic.
Michel G. (verified owner) –
Software point of view:
Web interface very nice and easy.
Integration with Home Assistant truely simple.
Hardware point of view:
The JST connector is really small and could be replaced by the same type as the EMS bus terminal to make the connection more reliable.
Really a good product.
hondapower (store manager) –
Thanks for the review.
Indeed the JST connector should ideally be a bit larger but I did not have room to fit a larger one on the PCB next to all the other connectors in the same enclosure.
Johan Vromans (verified owner) –
Manfred (verified owner) –
einziger Knackpunkt: bei Lieferung war eine Beta-Firmware installiert…..
Lutz (verified owner) –
Sehr einfache Einrichtungen, viele Daten der Heizanlage. Wunsch wäre mehr Informationen zu möglicher energiesparender Steuerung der Heizung, speziell Fußbodenheizung.
Ralf (verified owner) –
Tom Oeben (verified owner) –
Doesn`t work with an Unify Mesh Network. when changing the AP via Handshake it loses all WIFI Settings. Had to install an AP only for the S32 Gateway
BBQKees (store manager) –
Hi can you open an issue on the EMS-ESP repository?
I have several Unifi access points here and it works fine.
Ingo (verified owner) –