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Oh, and if the cold feed is blocked, you will find it where the cold feed / expansion pipe coming from the bottom of the tank goes and connects to the rest of the system. Usually, I find that the problem is an airlock on the cold feed/ expansion pipe. This should run vertical, dead flat or...

Try getting a big old towel and get that manual air vent opened up. See if it is full of air. If you have a blocked cold feed, then the water / air will stop coming out of the vent. As you have a cylinder stat, it is possible that you could have motorised valves. Look under the floor for the...

As Dan said, the fitter was an idiot. That's why the tank imploded. The issue is that they had an issue with air being drawn into the system through the vent. So instead of sorting the problem, they relieved the symptom. The answer is to uprate the cold feed from 22 to 28. John...

The theory is good.... Until someone hangs their pictures.... Ask the ufch suppliers such as upinor. The obvious answer is rads... Hope that helps. John.

Seperated