Radfan Slim Radiator Fan 3 "A great concept but only activates at high radiator temps" Rachel Stammers 27 November 2019 Unobtrusive, lightweight, easy to set up, but overpriced for what it is Initially, it didn't turn on at all when the radiator warmed up & I thought it was faulty! By increasing the thermostat in the room to make the radiator REALLY hot, the fans did turn on & it did appear to even out heat well. But since we are trying to save energy by not overheating our room unduly, it wasn't for us and I ended up returning it. A shame it doesn't have a manual control or activate at lower rad temperatures, I would definitely have kept it if this was the case, to get the benefit of even heat distribution. A note from the team Many thanks for placing your review. We're sorry to hear the Radfan slim radiator fan hasn't been suitable for your home and we're glad we were able to put things right for you.