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- Dec 25, 2011
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I've seen that ball valve on a header tank all seized up with an open topped header tank in a (hot) loft. Eventually the amount of water in the system decreases (takes a while) as it's not being topped up and obviously air locks form. Assume it's a gas boiler don't some of them sense if the water in the system is low and shut down?We had a Honewell 3 port valve operating for 24 years... never replaced anything on it....
Back on topic...
A quick daft question...
On this heating system has it been drained recently???
any air pockets not fully bled out????
:C