In floor heating

Had a read-up on this, but there are a few concerns. Talking to someone in Scotland who had a ASHP with  underfloor heating, but with wooden flooring in lounge/dining room.  Temperature in those rooms was low, as wooden floors act as insulation, so low heat transfer=higher running cost.

I'll defer to Badger on this subject, but his valid point about the overlaying wood flooring being an insulating material becomes (obviously) less of a consideration if the wood flooring is thin. The illustration on the Warmboard site indicates boards of about 15mm - it is possible to get reasonable 'system' wood floor finishes as thin as 10mm.  It looks to me like a fairly okay system for a wood constructed structure. Maybe the use of the aluminuim (pipes and sheet) even goes some way to addressing the warm up/cool down 'lag' associated with conventional underfloor systems in heavyweight constructions.

There does seem to be mixed reviews on the product. I found a couple of forums (U.S) where it was being discussed. May be worth a read. http://www.contractortalk.com/f11/warmboard-radiant-heat-48360/ http://forums.jlconline.com/forums/showthread.php?t=33410 With the warmup/cool down lag in heavyweight UFH, this can be controlled by the correct heat delta setup  and as mentioned in the above forums, they suggest using a external air sensor as well.