The overflow pipe from the cold water tank in the loft is constantly dripping.
I had a look, expecting the ball cock to need it's height adjusting or a leaky valve.
In fact, the vent pipe from the immersion tank on the first floor landing is discharging in to the cold water tank at a constant drip. This forces the water level up to and down the overflow pipe.
I do not know how the immersion tank works in detail. Is there a valve that shuts the cold water when the tank is full that may need replacing.
The overflow drips wether the immersion tank is cold, heating or hot.
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