Water keeps on disappearing after I fill up gas boiler heating system after a few hours. Red security light comes on and heating system won't ignite until I fill it up again. Then after a few hours light goes on again. Usually I don't have to refill until after 24 hours. What is going on? Where is water going? No leaks or anything. Please help

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Originally Posted by Seppo

Water keeps on disappearing after I fill up gas boiler heating system after a few hours. Red security light comes on and heating system won't ignite until I fill it up again. Then after a few hours light goes on again. Usually I don't have to refill until after 24 hours. What is going on? Where is water going? No leaks or anything. Please help

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There are a few possibility's. If you have any water pipes from the boiler concealed like under ground could be a problem. What you really need to do is give a better description of exactly what you have as far as your system goes. Is it a cast iron or copper boiler. Storage or instant? Info like that can be of great help. One item you might check is your expansion tank. Many times the rubber bladder types will leak and that can cause some of the water in the system to seem to disappear.