programmable (?) individual TRV to act as 'zone valve' for one room (of 14). Does this exist?

[Rad]

Dear All, As I write I am putting in a new boiler Remeha Avanta 24V to replace my old Clyde Combustion. I have 17 rads one of which is going. Most of the time when SWMBO is out, I work from home in one room so do not want the whole house heated. It is on the first floor and would be a PITA to put in a zone system which I won't do. I want to avoid having to turn on and off a TRV, the present system, and wondered if there was a (?) programmable thermostatic valve that wirelessly turned on the system for only that radiator. Maybe it would have to have its own motor? and some how open the CH zone valve? How it would avoid sending heat to the other rads set to be open is difficult to imagine but presumably if the motor is only on that rad it will predominantly circulate to it bypassing the others mostly? Can't see this myself but have been told that such a system exists and am relying on collective wisdom to tell me if this is wrong as I think of if some wizard has thought up a way to do this. Chris

[TheScullster]

"Rad" wrote

Can't see it either TBH. Either a separate zone for that rad from the heating circuit, or teed into the hot water side instead. Still need some jiggery pokery to over-ride the cylinder stat though - maybe a local room stat would do it.

Phil

[chris French]

In message , Rad writes

There are rad stats that can be programmed and controlled remotely, and which will switch the system on and off but as you say, it won't be any good having just one of them, you'd need them on all the rads. Otherwise the HW will just circulate around all the rest of the rads.

Unless there were zone valves to control the flow to other parts of the system, which you don't want to do.

Maybe just have the CH off and use electric heating in the room for those times you use it?

[VAG_dude]

Have you had a look at Honeywell Hometronic?

[Mike Clarke]

Honeywell CM-Zone but to fit them to 16 radiators could cost about £1,200 (£480 for a starter pack including controllers and 6 TRV's plus 10 more remote TRV's at £75 each). Possibly a bit less by shopping around.

[snip]

Yes, it could take several years for the extra running costs of electric heating in one room to match the £1,200 cost of the CM-Zone system. Taking an example of a 1 KW heater running on a 50% duty cycle 8 hours per working day with electricity costing an extra 5.5p per KWh compared to gas that's only 22p per day or nearly 5,500 day payback period! Also I'm not sure how much a gas boiler's efficiency would would drop with just a single radiator to feed.