"These valves have a fundamental design flaw. The thermostatic element in the bonnet of the valve is not thermally isolated from the valve body so the valves operate on water temperature rather than room temperature. I've installed 3 valves and none functioned correctly."
"Bought 6 pair of these valves and found after fitting them that they turn off before the room heats to the selected temperature. also you need to get down on your knees with a magnifying glass to select the required temp. and then its half guess work as the only guide is the thread marks of the screw on the spindle!"