M
manny.p
Hi all new on here and looking for advice. I ran wiring for an extension and took a 13a spur from the ring main using 2.5mm2 t&e for the underfloor heating controller. The homeowner has got someone in to lay the the heating mat kit 20sqm of it and when the tiler connected to thermostat he said 1 part of the mat heats up fine but when you put 2 on then it takes time. 2 mats provided as area is over 12sqm. He said the wiring may be wrong nod overheat the cable from ring main to spur. Can anyone help with whether the correct cable was used. Mat total watts is 3kw and thermostat can handle 16a. Thanks manny