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I have checked my whole system for leaks and cannot find any ?

My Baxi boiler still keeps losing pressure. I am having to refill it every day sometimes twice a day.
Ian James, January 2011
try changing the threewayvalve this was happing to my boiler i changed the valve and the pressure lost stopped

jon c, January 2011
Could be the heating body leaking and evaporating the water hence no leak visible!

boiler bill, January 2011
more than likely going through overflow outside

ross, January 2011
look some more,you have a leak

mm, January 2011
link Click here to see other fixes for Baxi.