? what?
Are? You talking about?
Total utter bollocks!
You haven';t a clue, have you?
It dominates teh market because we didn;t have propelt isnualted house, and its gfar esier to istall after market.
UFH is FAR better and more comfortable and FAR more even in temperature..if its done as part of the overall design.
Mine is perfectly capable of heating the rooms its in to well in excess of 25C. And that's the temperature they STAY at. Because there's about 4 tons of floor in each one a..open a window, cold air flows in..shut it, and within minutes that 4 tons of concrete has warmed it back up, using nice natural convection.
The whole point about an in-screed UFH is that it is almost IMPOSSIBLE to change the room temperature quickly. We have the UFH on, and then light fires as well. Our open fire kicks out about 5Kw plus. It STILL takes about an hour to pull the room up one and a half degrees. Theres about 1500W of UFH in there. That takes even longer. But conversely, if you shut it down at midnight, its only dripped three degrees by morning, on the coldest nights.
Rooms which do NOT have the thermal mass like upstair rooms with wooden floors, warm up just as quickly with UFH as with anything else, and cool down as fast. UFH is after all just a radaiotor spread flat across the floor.
The biggest advantage we find is this. In order to not feel cold, it seems that you want the coldest part of your body to be at a given temperature. With UFH there is no cold layer of air arund your feet. So we actually feel warmer at lower temperures. ~The whole room is utterly even in temperature. Ther are no hot spots near radiators, no problems with them being blanked off by curatins or sofa..any cold air off windows slips to the floor and get warmed befoire it rises to warm the rest of the room. The walls being the coldest parts with the windows, set up mild downward flows, so you get an overall convection in the middle of the room, which is warmest, and cold edges.
With radiators the edges are warm, and the cooler downdraiught is in the center, where you are sitting.
Net result, you run the room hotter at the edges- where the losses are - to compensate. And hotter overall, to keep your feet warm. Radiators are a triumph of convenience over results. UFH is way ahead in the comfort and economy stakes, but its a total bitch to retrofit PROPERLY, which is why its got a bad name.