On 7 Mar 2007, at 14:28, Luther, Ron wrote: >>> http://www.devi.com/ > > > Hi Fred, > > > Pretty neat. Reminds me of flexwatt tape. That stuff > has been used for years by the DIY crowd for heating > reptile rooms and the like ... but I don't see why > it couldn't be used in other applications. > > http://www.arbreptiles.com/cages/flexwire.shtml Underfloor heating is good because it doesn't need to be as hot as radiators. Plus, your feet are more heat-sensitive (and need to be warmer for *you* to feel warm) than your head. So a gentle heat to the feet is a much more energy efficient way of heating than convecting radiators that just put a pool of hot air above your head. This is why underfloor applications are *great* for ground-source heat, which usually trickles in at the 40C mark for much of the year, rather than the 80C of radiators. Now, if you can boost that *just a bit* (by say Solar-thermal collector), then your efficiency spikes quite impressively from 350% to 600%: http://www.treehouseclapham.org.uk/ecobuilder39.html Cheers Martin -- > Spammers: Send me email -> yumyum at easyweb.co.uk to train my filter > http://www.nuclearelephant.com/projects/dspam/ Sell Cloth Nappies from your website: http://www.purpur.co.uk/announcing-purpur-associates