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The dem10 or similar is rated for a 2 to 3 bedroom house so it doesn't need to be in the same room. So long as your bedroom isn't a sealed lab, it will work wherever you put it but of course be most effective in the room it lives in. It's about as loud as an older fridge I'd say. Same kind of moving parts but not as enclosed.
I got Hive installed for CH as i was in the same boat, no thermostat whatsoever, and I think it's great.
(not yet bought one) @stevo_com
After looking at the state of our windows in our bedroom this morning, (bed under window, curtains blocking window, 2 adults and a child snoring and farting in there from 3 am most nights it seems) I should probably use one. Loud though eh?
Also, need to sort out actually having some heating control at some point.
(current: ON or OFF no temp control)