The Heatmiser UH8 RF v2 is an 8 Zone Wireless Wiring Centre for Water Underfloor Heating. It includes a Hydronic (Hot Water) power source. This underfloor heating mat system operates on a voltage of 230V and has a control style of both switch and digital. The unit is designed for easy mounting under the floor and has a sleek white plastic finish. With a compact design of 384mm width and 148mm depth, the Heatmiser UH8 RF.