Many winters I've had a radiator that hissed angrily and gave off steam when the boiler ran for a while and heated up. I woke up and had to lower the thermostat to stop the noise, only for it to wake me up an hour after the cycle restarted. Thanks to a family member and reading online, I found out that these steam vents need to be replaced. no need to lower the thermostat ahead of time
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