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Thank you all . I shall attend to the suggestions and come back. Stan, the problem is when some body has had a shower the radiators run less warmer and the house gets cold. When the system has been switched off overnight and when it comes on in the morning CH works fine until hot water is...

I have read a lot of your usefull advice on heating and specially on Vaillant boilers and was hoping that you may be able help me. When CH is switched on boiler fires and run for 25 mts to get the temperature to 80. On reaching 80 flame goes off and comes back when the teperature has fallen...