I recently bought a 500w oil filled rad and a plug in thermostat to regulate the heat at a constant temperature. Well, that was the plan............ the thermostat (Timeguard ET05) resets itself to 20 degrees after a few hours, which is no help at all!! Finally got through to Timeguard today and they told me it is a known fault when the unit is used with a heater under 3kw and "all their stock has been quarantined and they are in discussions with the manufacturer in China". The only advice they could offer was to put the radiator on a timer and contact them again mid to late January. Has anyone out there got the same problem or am being fobbed off??