You need to find out why it is blowing. I am having the same trouble and it only happens after 23.30. I am beginning to come to the conclusion that the local water authority is reducing pressure at night for reasons only known to them. I am monitoring my pressure and flow for a week. The minimum should be 1 bar and to fill a one gallon container in 30 seconds. If this is the case I will being taking a complaint to the top. £15 for parts to my shower plus the call out, which I don't need: lets say £60 to £100 of damage in total.
Waterworks, November 2011
