Viessmann 200w Weather compensation - underfloor heatg ?

a call for heat for the floor with on off controls will need a supply temp much higher than a. compensated flow

Not with the Danfoss rtl valve. If the flow drops as low as the rtl setting of say 30c then it will perform as intended.
Double meander loop is important.
£50 quid. Job done.

I think the smallest Danfoss valve will only do a 10M2 floor area mate, but they do a larger one. But certainly they're the cheapest way of doing conservatory UFH.
 
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... and the required underfloor flow temp will always be lower than the rad temp.
 
Fitted a danfoss valve system in a 20m2 room all in one kit, works a treat, I'll be fitting one for 16m2 in brother in laws extension
 

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