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And also, how do you flush the system?

Thank you so much for this!!! Just one thing I wanted to check that I can't remember if the combi can do this (I think it does...) If I put the Central Heating on, can I also use the hot water to have a shower as well and still get good temperatures on both or is it designed for one way or...

Hi, My Vaillant is about 3-4 years old. We are having this problem whereby the hot water will work fine until we put the Central Heating on from the Thermostat. If we switch off the hot water and turn it back on, it never really get hot, hot just warm. If we switch off the central heating...