The temperature after the gas boiler is turned off

  • Hissing / Whistling Sound Coming From Boiler - Hot Water

    Jan 05, 2009 · About 10 seconds after the boiler cycles on, a hissing / whistling starts. It sounds kinda like a tea pot on the stove starting to boil. It seems to be coming from the boiler. There is no visible steam from the outside. The sound lasts for about a minute and then it dies off.Learn More

  • What Noise is That? 10 Common HVAC Noises Explained

    Clunking and banging noises tend to occur when scale accumulates on the heat exchanger. According to 24/7 Home Rescue, "This blocks the flow of water and causes some water to boil, steam and expand," as in a kettle. Boilers also whistle, which could be an effect of either kettling or trapped air in the system.Learn More