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The thermostat is only rated at 16 amps, the way you are suggesting was how I was goin to do it originally but I was concerned that the thermostat rating would be exceded??? Would the DP switch be 20A ??? Thanks

Thanks. you have n't confused me, youve actually made my decision for me. 20a mcb feeding 20a 2 pole contacter ,rcd protected. Cheers

Thankyou...I think your probably right...I'm gonna go the contactor route, cover all the bases that way. Unless anyone thinks this is OTT Thanks

Sorry I mean 4.25x4.25..Its underfloor matting and the manufacturers are quoting 200 watts per sq metre output...is this enough info? Thanks

Hi I am installing Underfloor Heating approx 18m2 @200w/m. I have a dedicated feed available(rcd protected) From The CU. Can someone please advise 1/ Do I need an FCU between the feed from the CU and the thermostat? 2/ If so what size fuse should I use? 3/ what size mcb at the CU...