Hi Richard, thanks for your question. Yes, you can use underfloor heating systems with our Aquafloor panels. Ideally, you would want your heating system to be a good half foot (12.5mm) beneath the Aquafloor panels and for the temperature not to exceed 60 degrees (centigrade) but if you're not sure as to whether that'll be the case, please give us a call and we can talk you through the options based on your individual bathroom floor situation.