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Hey hoping someone can help me out with a question I have with my central heating. When I put the heating on the rads gets nice and hot but once on for a an hour or so they cool down a bit still hot but not as hot and takes the house a while longer to heat up. Also the kitchen radiator I replaced as cold at the bottom and warm at the top but still get the same issue, this one is also last to heat up by about half an hour. Thanks