I am battling with my Devimat which is to be laid onto a concrete floor. The instructions are far from clear. I understand about the chanel for the floor sensor, but what about the cable from the mat up to the thermostat? Do I just get the tiler to bury this in his tile adhesive or what. I am tiling from wall to wall so can't just hide it under a kitchen unit. Also, I dont think my electrician tested the ohms - he just told me it works. Can I check the ohms myself? Any help gretly appreciated. Marliz