I have two ways of controlling my floor heating installs.
One is the probe type t-stat which you set for an appropriate temp such as 25C (77F) for example and the tank or boiler sends the water out through a thermostatic mix valve. The boiler temp is then separate from the floor temp, to some extent.
The second is to have a 3 or 4 way mix valve based on an outdoor reset control and no internal t-stat. This is the way I run my own house, drives the wife nuts. Most people want some control but in the end if it is comfy, they soon forget about it.
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