Can I use any carpet underlay when fitting UFH in my lounge? 

We recommend using a carpet underlay with a tog value of 0.8 or less. This underlay is widely available and should cost no more than an average underlay. Some underlays used in the past are:

“ROMA” by Ball & Young

“TRACTION IMPACT” underlay (0.79 tog) from tradepriced.co.uk "

"HEAT-FLO" by Duralay - Tog value 0.77

"CRUMB DURAFIT 500" by Duralay - Tog value 0.59.

N.B. The above underlays are just a selection of those available in the marketplace.