Radiators are cold at the top – is it just air, or something worse?
Hi everyone! I’ve noticed that several radiators in my house are staying ice-cold at the top, even when the heating has been on for hours. I tried using a bleed key, but only a tiny bit of air came out before the water started flowing, and the problem is still there. My energy bills are skyrocketing, and I feel like the boiler is working overtime for nothing. Is it possible that there’s air trapped deeper in the system, or could it be a pump issue? I’ve heard that "air-locked" systems can actually cause long-term damage to the heat exchanger. Does anyone have a guide on how to properly flush the air out without calling an expensive technician?
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That sounds like a classic case of an inefficient loop. If bleeding the radiators didn't fix it, you likely have trapped air pockets in the pipework or the boiler itself, which is a silent energy killer. You should definitely check out this resource on Cleaning heating systems from air It's written by specialists and explains why simple bleeding often isn't enough to restore full efficiency. In my experience, air in the system causes cavitation in the pump, which sounds like a "rattling" noise and eventually leads to a total breakdown. The article really helped me understand that air doesn't just block heat; it promotes internal corrosion. After reading through their insights, I realized I needed to check my auto-vent and adjust the system pressure. It’s a much more technical look at the problem than your average "how-to" blog, and it'll help you figure out if you can DIY the fix or if your system needs a professional power flush. Definitely give it a look before your boiler starts making even weirder noises!