And with that untruth from you:
And then goes to quote things that specifically don't support your case that anything I've said is an "untruth" - which I take as you trying to call me a liar without actually using the word.
You're just p***ed at (yet again) being called out for pushing blanket "facts" (in this case, "UFH can't work") which just aren't supported by observable facts.
I have not, despite your accusations of lying, said that the thermal conductivity of a medium changes depending on wether it's electric or water heating it. What I have said is that the physics of the system is far far more than the conductivity of the medium, and that different types of system have different characteristics. I've even pointed out some of the key areas - but you have ignored these as they don't support your view that I am "lying".
BTW - for an electric system, no I don't believe the physics of "the answer to the carpet issue is more powerful UFH". That might, for some definition of "more powerful" apply to a wet system, but not to an electric system. As you correctly point out (when not foaming at someone disagreeing with you), adding a carpet decreases the thermal conductivity between heat source and room. Within some limits, the answer to that is to increase the temperature of the heated layer (ie where the wires or pipes are buried). For an electric system, this will happen automatically since with the element turned on, the steady state is that heat lost to the room must equal heat put in by the element. If you reduce the conductivity of the system, then the temperature at the element will rise until the thermal flow is again equal to the heat input. Naturally there are limits to how hot it can be allowed to go - and increasing the power of the heater element won't change that. If you hit the upper limit of underfloor temperature before reaching the point where there is enough heat going into the room then yes, as you correctly point out, the room won't be fully heated. That is also something which, if you stop frothing for a moment to actually read and comprehend, I have not disputed.
A wet system is different. Heat input to the slab (or heat spreader plates) is a function of delta-T between the water in the pipes and the slab. Increase the slab temperature (by putting down a carpet) and the heat input to the slab will reduce due to the reduced delta-T. Compensating for that would need a "more powerful" system - either more surface area (more pipes, more closely spaced) or increased water flow temperature (again with not too generous limits if the system is to remain reliable).
