I hope someone can help. We have been having problems with our Boilermate 2000 which is about 7 years old. The radiators don't stay warm until they reach the room stat temperature. Frequently if you switch the system to permanently on or the boilermate starts on the timer the radiators will go hot for about 25 mins and then switch off as though the temperature has been reached. The hot water is fine and so far Scottish Gas who do the maintenance have replaced the sensors and its still doing the same thing. Does anyone have any suggestions?