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I have an RF205-TS radio controlled room thermostat which we hate for multiple reasons (including batteries falling out at regular intervals) which I would like replaced.
RSRF-1133-1000x1000_0.jpg

I'm assuming this would be an easy job but don't understand why this is wired into a Hager ESC225 25 Amp 2 Pole Contactor.
IMG_3889.JPG

Ideally I would like to replace the thermostat with a Heatmiser Slimline-RF and two channel Heatmiser RF-Switch (230v AC 50Hz 1 Phase). Also have underfloor heating with Heatmiser which we love so looking for consistency plus looking to move everything to.

Would we still require the contactor for this setup? I ask because it just looks a bit botched (although working fine). Hidden inside a cupboard which nobody sees but I'm a bit OCD and don't like knowing it's there.
 
what boiler do you have / heating
 
shouldnt need it then

normally you fit them when you have to use a 240v stat on a 12v system

or turning on a high load appliance

what does the stat turn on ?
 
Thanks Shaun. As far as I can tell it just controls the temperature for the rads. Under floor heating is controlled by 4 separate thermostats per zone.

The plumbers fitted this one when we installed our underfloor heating and removed the original vaillant thermostat which seemed to work much better.
 

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