UFH Thermostatic Mixing Valves

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Are there fundamental differences in some of these TMVs?. The attached one, below, would seem to be the better type where a shuttle moves to balance the hot&cold flows, as it increases one flow it decreases the other to keep the mixed flow constant, necessary say in showers etc. I have seen comments where apparently some UFH TMVs just control the flow through the hot flow port to mix with the cold manifold returning water. In view that some have trouble with UFH & rads on together, ie rads being robbed of water by the UFH etc while others have no problems (both not using LLHs or CCTs) wonder if the type of TMV has a bearing on this?.

Service kit for a Reliance shown further down but don't know if this is the balanced type.

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