Quote Originally Posted by imagine View Post
the boiler will kick in anytime you run a hot tap or shower, in the winter when the boiler is heating the house, you wont notice or hear it kick in for the shower,

cold water from the mains will be colder in winter and use a little more energy to instant heat
This might be to do with your body temperature. Then again I might be wrong. Surely if the thermostat is working correctly it should be the same temperature all year round.