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I had a wet system installed in the ground floor of my last house...loved it. We had a tiled floor from the front door to back door (open plan) and oak in the front room. As this was a fairly new house (50's Semi) it was all over a concrete base, so it retained the heat. Also the lack or Rads meant we could put furniture where ever. Its the one thing we really miss in the new place.
Also had an electric setup in the bathroom upstairs....that was also ace, though not so when your wife cranks it up to 35 degrees to dry out the bathmat (and then forgets leaving it on for hours so when you stepped into the room, you burnt your feet and all the moisture from the eyes evaporated) .
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Bit late to this but if you go for underfloor heating make sure you seal the feet of any wooden furniture you've got - it's normal to leave the feet of cabinets and chairs unvarnished, but wood (especially oak) will dry out and change shape if it's got constant heat running up the grain from contact with a heated floor.
My ex's dad is a cabinet maker in the North East - we spent one summer driving around helping him to collect old furniture he'd made, the owners had since installed underfloor heating and the cabinets needed some serious repair.
Wet for sure, only considering it for the ground floor. Haven't got the ceiling heights on 1st and 2nd floors.
Ground floor plan is as attached.
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