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Does not sound like central heating. It sounds like a boiler system. When the hot water is routed through the cooler pipes and radiator, the air in those pipes are pushed through begins to expand and it causes the same effect as a tea pot boiling on a much larger scale.

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12y ago
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16y ago

they click because they are being heated up to satisfy the thermostat.

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12y ago

they are clicking cause they are heating up. the heat causes expansion and that's why you hear clicking.

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Q: Why do the radiators in your house click when you start the heating system?
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Continue Learning about Engineering

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The electrical system, plumbing system, heating/cooling system and drainage system


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The answer depends on the thermostat setting as well as the kind of heating system that you have.


What is the purpose of plumbing?

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How much does it cost to replace steam radiators with forced hot water heaters?

Are you considering this in a residence? A friend of mine converted a residential steam system with cast iron radiators to hot water for child safety reasons. It all worked, but he had to deal with some water leaks at joints in the radiators. That was a nuisance. The amount of heat delivered to the house will be different with water, but I can't remember if the radiators are oversized or undersized after conversion. In his case it heated fine. Call a professional. EPM


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If it is white "smoke" then it is probably not smoke at all but only water vapour that is being cooled as it enters the cold air outside the house. It is nothing to worry about as long the heating system is working normally and also as long as you are having the heating system serviced every year by a licensed HVAC (Heating, Ventilation and Air Conditioning) engineer.Black or blue smoke coming out is another matter altogether and could indicate a dangerous fault in the system. If you see that kind of smoke coming out it is time to call a licensed HVAC engineer to inspect the system and advise you what should be done.

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