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2nd Gen.
The scenario was that Hive had the outage on their APIs but my internet was up... Hive doesn't like this failure mode. It checks internet and if it's available assumes the APIs must be available... when they aren't, the only thing you can do is fully manual boiler control.
It was a multi-day outage last Autumn.
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Tado doesn't like it when your internet goes out either, although it does allow manual local control of TRVs / thermostat, and does act as a regulator - it's just the programming that stops, and everything switches to dumb mode.
I've not checked what happens to water though - I guess it defaults to the last known stated (i.e. on or off).
I'd love it if they released a self-host option.
Just reminded me to test this. With no internet the app doesn't work, but the thermostat still controls the heating as normal.
Was your Hive the first gen?