Looking for automation-friendly HVAC

I'm planning to install new heating/cooling/hot water system at home. Does anyone know a brand/model of equipment that can be monitored and controlled from a custom home automation system? Locally, of course, nothing should go to/from the Internet.

Ideally -- something like Hue hub: you plug ethernet -- you get http api, but since such thing is too good to exist, all sorts of special control protocols will also do, as long as it is a documented and intended to be used by a third party.

Ah, and I'm in the EU, and the stuff should be available (and not too exotic) here :)

edit: phrasing

Submitted by equidamoid

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