Not strictly ESPHome but there is another project which provides an interface between Home Assistant and the Worcester Bosch Greenstar Boilers. It requires a hardware board (which can be ordered online). I’ve previously had this setup with my boiler but decommissioned it when I had some work done on the heating system - I’m planning on reintroducing it again though. It does provide heating control (which I know you’re not interested in) as well as providing status information.
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