EMS bus compatibility
EMS bus versions
The EMS bus has been around for quite a number of years. It has evolved into several versions:
2 wire bus
They all use the same physical bus, but the protocol used on the bus may vary slightly between versions.
Other bus protocols
Old boilers do not support the EMS protocol but may use the iRT protocol. Also a small number of Bosch boilers use OpenTherm instead of EMS.
Bosch boiler and heat pump brands
Bosch boiler and heat pump brands include:
EMS device support list
Support for specific devices depends on the firmware on the Gateway. Support for new devices is added with every new release. If your device is not in the list, it might still be fully or partially compatible. If you are missing parameters you can open an issue on the code repository to get support. The firmware supports all 4 heating circuits 1 to 4 simultaneously.
Non supported devices
Older boilers that use the iRT protocol like the Nefit Ecomline.
Boilers with an UBA 1.0 / UBA 4000
Boilers with an UBA 1.5 / UBA 4001
Heatronic 2 boilers
Boilers that use the OpenTherm protocol - Nefit ProLine NxT and ProLine ECO (however the ‘normal’ ProLine uses EMS).
Home automation system compatibility
Other MQTT capable systems
Other Restful API (Loxone etc)