Suitability
Underfloor heating can be used with most types of carpet. As long as the underlay is not a good thermal insulator, heat will easily pass through this layer into the carpet itself. The overall Tog value of carpet and underlay combined should not exceed 2.5 with the underlay itself not exceeding 1 Tog. Felt and polyurethane underlays are best avoided as they are good thermal insulators.

Underlays which work well with floor heating include Tredaire Technics 5/6 and Duralay Heatflow by Interfloor.