yeah i know the theory behind the thermostat, but what I'm saying is that because there is no abartiy point at which it turns on, it is continuous, therefore under load were the radiator is needed the most, the thermo is never actually fully open of fully closed?
See what I'm getting at?
Unless they have large a latent heat, were its set at 85 but in reality the water temp say goes up to 90/95 before it fully opens, then goes down to say 70/75 before it fully closes.