Hi all, has any one any ideas what might be causing the following We have a water tank with a normal gas boiler which is gravity fed, with a three way valve operating to split water to the radiators. The tops of the radiators are getting hot when the central heating is turned off. Reading online everything points to a faulty three way port but I’ve just discovered the boiler temp is set to 80 degrees but the tank stat at 60 degrees. Is it possible the stored water has been getting too hot and then sent to the radiators or is there anything else other than the three way valve that is causing it. The whole system is less than 3 years old.