OK Dan Robinson. I suppose it simply gives more controllability.
I was thinking that you would only need one per room as it would cut off the radiator or flow of water to the radiator it's connected to.
But of course you would need one per radiator as otherwise they would keep pumping out heat? Whereas if you have three then any one radiator might trip the others to reduce flow and limit heat if the room temperature is achieved?
I'm not really sure how it all works together as yet I am just guessing.
I was thinking that you would only need one per room as it would cut off the radiator or flow of water to the radiator it's connected to.
But of course you would need one per radiator as otherwise they would keep pumping out heat? Whereas if you have three then any one radiator might trip the others to reduce flow and limit heat if the room temperature is achieved?
I'm not really sure how it all works together as yet I am just guessing.