I hate mission creep
Having had several die on me over the years, the idea of a heating pump that monitors ITS OWN performance and sends me a text message or e-mail if it's feeling poorly is very tempting. But the key features are that it does all the checking internally, not downloading data in real time to GCHQ, and that it has very hard-wired connectivity limitations, i.e. outgoing SMS or e-mail only. Perhaps it could tighten up further by only sending a message to a local receiver in the house that displays them on a status screen, so no need for any outside connections at all. How about an IntRAnet of Things?
Hmmmm....maybe I see a major business opportunity here. NB the above is all MY idea, and I'll be lodging patents shortly.