evohome_cc is a HA custom component that works with some Honeywell 868 MHz RF-based systems such as evohome, Sundial, Hometronic, Cohronotherm and many others.

The simplest way to know if it will work with yoursystem is to identify the box connected to your boiler (or other heat source) to one of (there will be other systems that also work):

• R8810A: OpenTherm Bridge
• BDR91A: Wireless Relay
• HC60NG: Wireless Relay (older hardware version)

It requires a serial-to-RF devices, either a Honeywell HGI80 (rare, expensive), or a 868 MHz nanoCUL (eBay, ~EUR25, don't buy the 433 MHz version) running evofw3.

It uses the evohome_rf client library to decode the RAMSES-II protocol used by these devices. Note that other systems, such as HVAC, also use this protocol, YMMV.

See the wiki for installation, configuration, troubleshooting, etc.