just got out of the shower and yes before many say it, it is a pretty sight too, anyway back to the story, does the water get colder in winter so you have to put the shower on to hotter, and in summer the water heats up so you can reduce the heater for the shower,
We have a combi boiler so put the shower on and the boiler kicks in, just seems strange to me so does it happen to others in winter too