evohome_cc is a HA custom component that works with some Honeywell 868 MHz RF-based systems such as evohome, Sundial, Hometronic, Chronotherm and many others.
The simplest way to know if it will work with your system 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 or R8820A: OpenTherm Bridge
- BDR91A or BDR91T: Wireless Relay
- HC60NG: Wireless Relay (older hardware version)
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.
It requires a USB-to-RF device, either a Honeywell HGI80 (rare, expensive) or something running evofw3, such as the one from here.
See the wiki for installation, configuration, troubleshooting, etc.