Advice on replacing Central Heating Room Thermostat

[Solorize]

Hi,

I would like to replace my existing manual room thermostat which is a “Danfoss Randal RMT 230”,
but could do with a bit of advice.

Due to the current location of the existing unit, tight up against my sitting room door! I could do with
a bit of advice on which model I should replace it with and which would work with the current wiring
(which is shown in the images below).

Due to the location, as said above, is next to a door and in close proximity to my TV unit,
would I be better to go for a wireless unit? (price dependent).

I would preferably like to go for a electronic 7 Day programmable room thermostat.
Also, the hole in the wall that the existing unit fixes badly into, is 80 x 80mm so would the new unit
would need to cover this up, but still be able to fix onto the wall, I may have to turn the new one
90 degrees (i.e. mount it vertically) so that it can cover up the hole.

Please note I will be attempting to install the unit myself, so needs to be simple =)

Also is there anything else I will need to look out for i.e. matching voltages etc..? and would my
type/make of boiler make any difference in which one I should go for?

FYI.
My boiler is: Glow-worm Ultimate 50 FF Non-Condensing Gas Conventional (Regular) boiler

I would be willing to spend approx £100 max on the new unit.

Any advice would be greatly appreciated.

Images of current unit:

Current wiring



Wiring diagram



overview of location


Boiler

 

[Dotty]

Go wireless but you'll have to reconsider your outlay.

 

[Solorize]

Hi,

Thanks for your reply.

I am swaying towards the Honeywell 727.

Someone else i've been speaking to has recommended this as I will be able to have the thermostat
located in a different position.

 

[tinbasher]

i would not go wireless sick of changing batteries.i moved mine when i was about to decorate.

 

[Dotty]

Batteries should only need replacing once a year!

 

[robdav99]

I have exactly the same boiler and fitted this last year
SALUS DIGITAL ELECTRONIC ROOM THERMOSTAT STAT RT300 RF BNIB WIRELESS !!!! | eBay

has been perfect, can't complain about anything.

 

[Roger Welton]

Salus is a swear word around here

 

[robdav99]

lol, why is that? I have fitted quite a few and never had any problems, yes that are cheap and abit nasty but they have always done that job.

 

[electron]

Go the Honeywell route either fixed (CM907), or the CM927 Wireless.
I've fitted both, for myself CM907 (Incidentally within you're Budget) and the Wireless for my daughter; who had no existing thermostat
fitted to her system.
Both straightforward from the Honeywell instructions and Boiler Info Manuals.

PS: Boiler Info and Honeywell Manuals available on line

 

[dave1]

These digi stats seem to go wrong all the time, does anyone know of a reliable one. Seem to replace the Drayton receivers a lot.
Can't beat a 240v stat IMO it just needs to be in the right position.

 

[Ray Stafford]

See this posting from another thread based on our in-warranty returns. It surprised me.

Its a good point about RF controls.

I just looked up our return rates - we sell 1000s of RF controls, so our in-warranty return data should give a good feel for reliability.

Return rate on Drayton RF products - 2.03%
Return rate on Honeywell RF products - 2.19%

Here's the one that surprised me:

Return rate on Salus RF products - 2.8%. I would have expected a bigger gap between the "budget brand" and the quality boys.

For comparison, the return rate on hard-wired products is usually 1% plus or minus 0.2%.

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[Roger Welton]

Interesting info there Ray