Quote Originally Posted by Terpe View Post
Radiators are only heated when the boiler is 'on', the radiator valves open, and the time clock is switched to "on".
Even then if the room thermostat senses that the room temperature is at the required level, the boiler will not come on.
If the room thermostat is set at 20 deg.C and senses that the room temperature is registering 20 deg.C , then the boiler will not operate and the radiators will cool down.
The radiators will remain cool until the air temperature falls and the room thermostat calls for more heat.
If radiators are heating up unevenly they may need "bleeding".

If you can't get your system to behave after all the advice, better you spend some money now to put it right than be cold and need to pay for a very high gas bill.

Is your shower an electric shower or is it connected to the hot water system?
It's connected to the hot water system..