Gateway S3 (Standard WiFi Edition V3)

Description

This Gateway S3 (Standard WiFi Edition V3) is the only link you need to add your EMS devices like your boiler or heat pump to your home automation system via MQTT or HTTP REST API.

Just plug in the Gateway into the EMS service jack on the boiler or inside the heat pump with the optional EMS service cable and stick it to the side of the boiler. No additional cables are needed and everything is powered from the EMS service jack itself.
If your boiler does not have an EMS service jack or you want to mount the EMS Gateway elsewhere, you can also connect the EMS Gateway in parallel to the thermostat on the EMS screw terminal inside the boiler.  In this case the EMS Gateway needs to be powered from the optional external 12V power adapter.

This Gateway connects via WiFi to your home network. If you need LAN/wired networking have a look at the Gateway E32 V2 here.
The Gateway connects directly via your home network to your home automation, no cloud, internet service or external accounts needed.

Its all neatly packed in a nice and small enclosure (90x50x24mm) that fits into your hand.

Features:

• 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 inside the boiler
• Circuit board based on the Espressif ESP32-S3 with 16MB flash and 8MB of PSRAM.
• Robust third generation BBQKees EMS bus circuit compatible with all EMS devices
• CE certified product (also valid for the UK)
• 2.4GHz Wi-Fi connectivity
• EMS-ESP firmware V3.6 or higher
• Complete responsive webinterface
• English, German, French, Swedish, Polish, Norwegian and Dutch language selection (more to come)
• Firmware upgrade via the webinterface or USB-C
• Configured for Home Assistant
• Supports the Home Assistant MQTT Discovery protocol
• MQTT Discovery also works with Domoticz and OpenHAB without plugin
• MQTT and Restful API for other interfaces like NodeRED 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.

New firmware features (available on all EMS Gateways):

• Set virtual remote thermostats for RC30/RC35, RC300/RC310/BC400 main thermostats
• Virtually set the SmartGrid (SG) and PhotoVoltaic (PV) inputs of heat pumps
• Calculate gas/energy consumption in kWh for heating and hot water of all boilers

Supported EMS device types (See the full list here):

• Boilers
• Heat pumps
• Thermostats
• Solar modules
• Mixer modules

To get an idea of exactly which and how many entities/parameters you will get check this page.

EMS Gateway power options:

• Service jack (with the optional EMS service cable)
• 12V DC (with the optional 12V DC power supply)

If your boiler or heat pump has a service jack you do not need the DC power supply, only the EMS service 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 one of the optional cables 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.

Included in the kit:

• Fully assembled and tested Gateway S3 (Standard edition V3.0)
• Self adhesive strip
• JST ZH cable for connecting external DS18B20 sensors (sensors not included).
• Optional: 3,5mm jack cable for the EMS service jack in 50 and 110cm length
• 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.

The current firmware of the Gateway already supports the long list of these EMS devices.

Does not work with OpenTherm or iRT boilers like the Nefit Proline NxT (normal Proline is OK), Nefit Ecomline, Buderus U104, U112, U114, U122, U124, GB112, GB122, Linea Kombi 23. These do not have an EMS bus. Please check before ordering on the EMS device compatibility page.

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.

Downloads:
Datasheet S3 Gateway
EU Declaration of Conformity S3 S3-LR