Can anyone help me. I have just moved house and we have a boiler with a separate hot water tank and then 2 thermostats, one upstair and one down stairs. We want ti fit Hive and I know we need one thermostat and hub to work with a boiler and separate tank however I cannot seem to find the multizone one for sale that we also need. Do I just need to buy a separate combi boiler one? have they stopped selling multizone?.