I do not know if you can help me diagnose this problem.
We have a standard system. However the cold FEED tank is HOT. With the pump running a small amount of hot water is being pumped up into the base of the Feed Tank (in addition to any expansion from the expansion pipe).
Any thoughts? Our plumber has suggested changing the Hot water storage tank suspecting an "internal" leak between the water and the heating coil. But I am suspicious of this diagnosis- as surely the hot water would be discolored from the dirty circulating water from the boiler?
i've just had the same issue but found that when the immersion was on the timer was not kicking off and heating constantly , replaced the timer and was now ok power/timer wise , but later again found the thermostat on the immersion(hot water tank ) was stuck shut and so the water was boiling like a kettle , the only way for this excess steam was to head out the vent pipe to the coldwater tank in the attic , got to the stage where there was no cold water in any pipe in the house , had to drain a 400litre cold water tank of hot water only , dangerous in that we could have been scalded when having a shower . Worth a look but don't know if you have a immersion connected to your system .The odds are if you can shut off the heating coil to your tank and heat with an immersion to check ??
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