I have a single-zone hot water radiator system and I was looking to balance out differences in room temperatures without going so far as to install another zone at the boiler. While there are thermostatic radiator valves I could install to give a bit of control over individual radiators, I was looking at a more "intelligent" solution like the Honeywell Evohome, a Netatmo Valve, a Micropelt or a Tado. But none of the products seem to be available in the US, which suggests that there is a fundamental difference between US and EU hot water radiator systems, though I cannot find anything concrete.
Is there a difference between radiator systems other than connectors? Or could I theoretically import and install the devices (assuming no FCC issues)?
Best Answer
Honeywell does not provide a ton of info, but from the installation manual it would appear that evoHome is assuming each room has its own feed and return pipe, and in addition has its own local valve. You're unlikely to find such a system in the USA -- and in fact I'm kind of amazed that UK homes commonly have such a layout. USA systems typically have one to 3 or 4 zones in the house, and all zone valves are near the boiler. A given zone will heat a few rooms with a single pipe loop, so you can't control on a by-room basis.
My impression is that this system is much more useful in a multi-office business space, as it allows centralized control of the existing valves in each office space.