EMS Bus Wi-Fi Gateway

On this page you can buy the EMS Bus Gateway; a complete plug and play set which includes the EMS bus interface circuit, an on-board power supply and on-board Wemos D1 Mini type ESP8266. All modular by design and neatly packed in a small enclosure (90x50x24mm). Just plug in the device to the service jack on the boiler with the supplied jack cable and stick it to the side of the boiler (its magnetic). No additional cables are needed and everything is powered from the service jack itself.
December 2019: The Premium II is now available that can also be powered from the EMS bus itself just like a thermostat.
All Gateways connect via Wi-Fi to your home network.

All Gateways have the same EMS bus interface circuit as the previous 'EMS interface board V0.9' which is used succesfully by many people all over Europe and beyond. It is now combined with the Wemos D1 Mini and a buck power regulator on the same PCB.

For all details about this device look at the EMS Bus Gateway info page.

EMS Bus Gateway on boiler
EMS Bus Gateway on boiler
EMS Bus Gateway kit
EMS Bus Gateway kit
EMS Bus Gateway Premium II internals
EMS Bus Gateway Premium II internals

>>>I made an unboxing video so you can see exactly what you are going to get<<<

EMS bus to TTL UART interface V0.9

EMS board white Aside from the Gateway I will stil offer the EMS to TTL UART interface V0.9. ('The EMS Level Shifter'). This board provides an electical interface between standard TTL level logic and the EMS bus. An EMS interface link to your system.
So this means one one side you have the EMS bus from the boiler and on the other end you can connect a microcontroller like an Arduino (Mega), an ESP8266 (Wemos, NodeMCU etc) or f.i. a Raspberry Pi.

Although there are differences in the higher level bus protocol, the board itself interfaces with Logamatic EMS, EMS+, EMS Plus, EMS2, Heatronic 3, 'Junkers 2-Draht-Bus-System' and 'Junkers 2-wire-bus' in Bosch, Buderus, Nefit, Junkers, Worcester boilers and devices.

All info about the EMS to TTL interface board and how to communicate with the EMS-compatible boiler is available at my Github repository.
All details regarding the boards' design can be found on the PCB-Files subfolder.

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 EMS board will not work on iRT boilers without a modification. See the bottom of the page for these iRT modded interface boards.

Ordering information and availability

You can buy each individual product below. Paypal keeps the count on the inventory.
If an article is sold out, it means I don't have it at the moment. I try to make new boards and Gateways every week. If sold out you can always send me an email for more information and availability.

Payment options are Paypal or a credit card via the Paypal checkout. You don't need a Paypal account.
For other payment options like bank transfer etc please send me an email.

--Available boards are only guaranteed when you can fulfill an order via the Paypal checkouts below.--

Shipping information

I offer shipping to the entire EU, Switzerland, Russia, Ukraine, US etc.
--I ship to your Paypal address! Double check the address when ordering!--

Shipping options

To keep the price low I also offer unregistered/untracked mail. If you use these options I am in no way responsible for lost packages.
Untracked packages are sent with PostNL. Price is determined by weight class.
Tracked packages are sent either with PostNL or DHL depending on destination and shipping day.

You will get an automatic notification from Paypal as soon as the order is prepared for shipping. If you chose tracked shipping, a tracking code will be also be part of that notification.


Shipping destinations

I ship to the entire EU and to all non-EU countries in Europe. Non-EU countries include Switzerland, Russia, Ukraine etc. I have also shipped to f.i. the US.
If you are unsure whether I ship to your country just send me an email.

For European destinations outside of Zone 1 (see below) and non-EU destinations choose the 'EU+Russia' option or the 'Zone 2/3' option.

-Zone 1 Western Europe destinations

10 Euro Zone 1 DHL tracked shipping is currently only available for: Belgium, Denmark, Germany, Finland, France, UK, Ireland, Italy, Luxembourg, Austria, Poland, Spain, Portugal and Sweden.

-Zone 2 and 3 Europe destinations

For tracked shipping to European destinations outside of Zone 1 (Western Europe) choose the 'Zone 2/3' option.
Other destinations on request.

Shipping times

I usually ship within 2 to 4 business days. For most Western-Europe destinations the transit time is about 5 to 7 working days after the packages are handed to the service center/post office.
For some countries (especially Eastern Europe, Ukraine and Russia) transit times may be quite long. If you have not received your package after three weeks, please contact me. Do not open a Paypal dispute.

Local pickup in Eindhoven (NL)

If you want to pick up an item in Eindhoven please send an email to bbqkees+pcb A T gmail.com to agree on a date and time.
In general its faster though to just have it shipped.

Tracking links

Paypal will provide you with a tracking link and code for your package. However, these link do not always provide the best tracking.
For destinations outside of the Netherlands:
If your package was shipped with DHL enter your tracking number on www.dhl.de.
If your package was shipped with PostNL enter your tracking number on www.internationalparceltracking.com.

Packaging

All boards that do not have a case are sealed in an ESD bag. Each order is securely taped inside a cardbox box for a safe transit. The box fits through the mailbox slot.

shipping boxshipping box

Buy the plug and play EMS Bus Wi-Fi Gateway Premium II kit
(Kit for MQTT f.i. Home Assistant/Domoticz)



EMS ESP Gateway Premium kit EMS Bus Gateway on boiler


As an evolution of the Gateway Premium (I), this complete plug and play set also includes the interface circuit, an on-board power regulator and on-board Lolin Wemos D1 Mini V3. All modular and neatly packed in a small enclosure (90x50x24mm) that fits into your hand. Just plug in the device to the service jack on the boiler with the supplied jack cable and stick it to the side of the boiler. No additional cables are needed and everything is powered from the jack itself or from the EMS bus wires.
The Gateway connects via Wi-Fi to your home network.

Proddy firmware logoThe Wemos comes preloaded with stable firmware from the great Proddy's Github repository so you have a working setup using MQTT (f.i. Home Assistant and Domoticz).
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 and Domoticz a plugin is available.

Premium II internals This new version can also get its power directly from the EMS wires so you don't need any additional power supply in cases you can't connect it to the service jack.
In some cases, f.i. if you already have multiple devices on the EMS bus (aside from the boiler), there might not be enough power left for the Gateway. In these cases you can either use the jack or an USB adapter.



Holes The board has the same interface circuit as the EMS interface board V0.9 but combined with a Wemos D1 Mini and a buck power regulator on the same PCB.
Furthermore it has a connector for directly connecting 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 it gets its power from the bus itself just like a normal thermostat.
In case there are already too many EMS devices on the bus, it can be powered with a USB adapter as well.
The set comes with a completely assembled and tested interface board with the buck power regulator and the preprogrammed Wemos mounted inside the enclosure.
A decent high quality 50cm long 3,5mm jack cable and a JST cable for connecting external DS18B20 sensors (sensors not included).
Furthermore the enclosure is magnetic so you can stick the device to the side of the boiler!

For all details about this product look at the EMS Bus Gateway info page.
Please consult the information page before purchase.

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.

The Gateway comes fully assembled, tested and loaded with the firmware.

Base price excluding shipping is 62,50 Euro incl. 21% VAT/BTW.

--I ship to your Paypal address! Double check the address when ordering!--
Only choose the 'Postage NL' option for destinations in the Netherlands please.
I also recommend DHL tracked shipping for Zone 1 destinations like Belgium, Germany, France, Spain, Italy, Poland, Austria, UK etc

Options (Total price includes shipping and VAT)

In stock. If sold out you can send me an for availability.

Buy the plug and play EMS Bus Wi-Fi Gateway Standard kit
(Kit for MQTT f.i. Home Assistant/Domoticz)



EMS ESP Gateway Premium kit EMS Bus Gateway on boiler


This set is almost identical to the Premium II kit above except if connected to the EMS wires directly it needs to be powered via a USB adapter.
So for those who can plug it into the service jack this is a slightly cheaper alternative.
This new Standard version is equal to the previous Premium (I) version. The other Gateway Regular version has been phased out for the Premium II.

The Gateway comes fully assembled, tested and loaded with the firmware.
>>>I made an unboxing video so you can see exactly what you are going to get<<<


Base price excluding shipping is 57,50 Euro incl. 21% VAT/BTW.

--I ship to your Paypal address! Double check the address when ordering!--
Only choose the 'Postage NL' option for destinations in the Netherlands please.
I also recommend DHL tracked shipping for Zone 1 destinations like Belgium, Germany, France, Spain, Italy, Poland, Austria, UK etc

Options (Total price includes shipping and VAT)

In stock.

Buy an EMS interface board V0.9


Full EMS board What you get is one fully assembled EMS interface board V0.9 with all components in place as in the above image.
All components are sourced from respectable European suppliers (so no fake Chinese IC's). Every board has been tested in RX and TX mode on my own boiler.
This board is compatible with f.i. Arduino, ESP8266, Wemos, NodeMCU, Raspberry Pi and other microcontrollers.
For the instruction sheet to get you started look HERE .

Base price excluding shipping is 24,50 Euro incl. 21% VAT/BTW/Sales tax.



If you are buying this board because you want to use it on a iRT boiler please purchase the iRT modified item below.

--I ship to your Paypal address! Double check the address when ordering!--

Only choose the 'Postage to NL' options for destinations in the Netherlands please.

Options (Total price includes shipping and VAT)
In stock.

Buy an iRT interface board (Experimental)


Full iRT board This board is a modified version of the EMS interface board so it works on older iRT boilers.
It is modified according to the info based on Victor-Mo's Github repository.
The code on the repository is intended to provide an interface to Nefit Ecomline boilers.

As the proposed modification is experimental and determined by trial and error based on a single use case, I cannot guarantee that it will work for everyone.

Base price excluding shipping is 24,50 Euro incl. 21% VAT/BTW/Sales tax.



--I ship to your Paypal address! Double check the address when ordering!--

Only choose the 'Postage to NL' options for destinations in the Netherlands please.

Options (Total price includes shipping and VAT)
Sold out.

Connection examples

EMS board on Arduino Mega
EMS board on Arduino Mega

EMS board on Wemos D1 Mini
EMS board on Wemos D1 Mini
EMS board on Raspberry Pi
EMS board on Raspberry Pi

EMS Bus Gateway on boiler
EMS Bus Gateway on boiler service jack
EMS bus Gateway screw connector
EMS bus Gateway on screw connector
EMS Bus Gateway RPi mod
EMS Bus Gateway RPi mod