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To John D There is an open funnel on the front of the tank. One plumber said this was crooked and the water was coming down the side rather than flowing away. However, I have felt the opening after the water has come through the ceiling and it is dry. The pipe connected to the funnel...

I will try and post a picture for you. The pressure regularly falls and needs correction by opening a value with a screwdriver on a tube that comes from the red ball. It normally sits with black arrow on 1.5, but then falls to below 1, and things start making noises. Thank you

Thankyou all for your help. To sambotc, yes, hot water is left on all the time, and heating temperature is controlled by the thermostat dial in hallway - even when away. The water coming through only happens when I get home after about half an hour. Whereabouts does the pressure relief...

This might sound like a silly query but several (7) plumbers have been unable to diagnose the problem. I have a megaflo heating system, put in by the builder in the house when new 7 years ago. I don't know about vented and unvented, but it has a red ball at the top and the air gap does have...