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I have a fortic f10 cylinder and it completely empties after a bath. it takes a good two hours until it flows again properly
Hi my name is XXXXX, X have been in the Plumbing & Heating trade for approximately 15 years, lets see if i can help. check the ball valve in the top is filling the header tank at a good rate. If it is then you may have scale in the tube from the cold header to the hot cylinder underneath, but I have never known this happen before.
I'll look at it later and come back to you.
Experience: Plumbing and oil fired heating
Hi John was it the ball valve?