Here at Naos, we have used Thermonet heating mats for many years. They are excellent quality and represent good value for money. The mats carry a 10 year warranty, and the suppliers have great technical help on hand if needed.
We always encase our mats in levelling compound to protect them and we test the mats several times during the installation, recording the readings. We also take photographs so that we have a record of how the mats run and log the installation with the manufacturers to support the warranty.
We’re always on the lookout for new technologies however. The new VarioPRO system which incorporates electric underfloor heating within a decoupling membrane is something that has caught our interest!