We have Wet UFH throughout our house, upstairs and downstairs. I would never go back to radiators ever again, not a chance. The heat is totally even through a room, no draughts or cold patches. Our gas usage is pretty reasonable, approx half what a house of our size should use according to our supplier. The comment about UFH not working or being inefficient when furniture is placed on top of it is far off the mark. Our downstairs is mostly oak flooring over the concrete slab and it is still incredibly effective.