A few questions about Hive, It looks like it consists of:-I have the Hive thermostat but Nest smoke/CO alarms.
That's about the size of it. The internal communications are based on ZigBee, so a mesh wireless topology rather than what most people would understand by Wifi. The hub can only connect to the Internet via an Ethernet cable (and British Gas try to insist that it is plugged directly into the broadband router).A few questions about Hive, It looks like it consists of:-
1) a battery powered, Wi-Fi connected Room Thermostat
2) a Mains powered Wi-Fi receiver which replaces any existing Heating / Hot water controller and is connects to your boiler
3) a Hub (powered by a mains to DC supply) that is wired to your router and is also Wi-Fi
Yes, it continues to operate fine if the Internet connection isn't there. The local devices can manage to turn things on and off to the schedule by themselves. The thermostat and receiver can also be installed without a hub. This is known as ‘stand-alone’ mode. In stand-alone mode the thermostat acts as a normal wireless thermostat.Q1) Does the system work (internally) without the Hub being connected to Hive servers via the internet?
Q2) Is remote control (outside your house) always via the Hive servers? rather than direct access to your router (with port forwarding)
The small amount of research I have done on Nest seems to confirms what you say, instead of replacing the heating / hot water controller as the Hive does they seem to leave it in place and use the new Nest room stat. to replace an existing one, I couldn't see why until I realised that the two channel controller shown was still needed to control the hot waterI'm not even sure I'd choose it now - haven't looked for a while but I'm not sure about its ability to manage hot water