What Causes a Heating Boiler to Make Noise When Firing?

Save

How a boiler works

  • Boilers use a fuel source: oil, gas, propane, or electricity to heat water to just below a boil between 160 degrees and 180 degrees. This heated water is sent through pipes throughout the building into radiators built in all of the rooms. As the hot water passes through the pipes in the radiators the pipes get warmer and emit the extra heat into the room. Now spent of its heat, the cooled water returns to the boiler to begin the cycle again.

Possible cause of boiler noise: mineral deposits

  • Hard water used by a boiler has a higher proportion of calcium salts (lime) in it than soft water. As the water is heated, these calcium salts become insoluble in the water and they settle at the bottom of the container in which they were heated. This can be a pot on a stove or the kettle for a boiler. The noise heard with boiler heating is known as kettling. When the water flows too slowly through the pipes, it can come to a rolling boil. The bubbles from this bang against the sides of the pipes and create a pinging or banging sound. A whole home water softener might help this issue.

Possible mechanical causes of noise

  • Boilers which are too large for the heating space or those with incorrect settings for the return flow rate can cause noise during heating. Both of these can cause bubbling and boiling in the pipes of the boiler system, which leads to the commonly heard knocking sounds. Ensuring that the heating boiler is the correct size for the job and that the temperature of the return water flow is only 52 degrees Fahrenheit different from the temperature to which the water is heated.

References

  • Photo Credit Wikicommons: public domain: http://commons.wikimedia.org/wiki/File:Gasboiler.JPG
Promoted By Zergnet

Comments

You May Also Like

  • Noises in Hot Water Heaters

    If your home's hot water heater is making strange sounds, you may be able to troubleshoot the problem by listening to the...

  • How to Troubleshoot a Weil McLain Boiler

    Weil McLain sells a variety of boilers for residential use. Both their gas- and oil-fired boilers are designed to be easy to...

  • How to Fix a Loud Furnace

    The most common cause of a "loud furnace" symptom is actually the ductwork and not the furnace itself. The noises you hear...

  • Why Is My Boiler Gurgling?

    A gurgling sound in your boiler system is a sign of a problem. Your boiler system may not start, or may struggle...

  • Boiler Circulation Pump Noise

    The circulation pump in a boiler-equipped heating system moves the water around inside its circuits. The pump pushes or pulls the freshly...

  • Loud Noises in Boilers

    Boiler noises can come from a variety of sources and take many forms. Banging, scraping, bubbling, gurgling and a host of other...

  • Why Steam Boiler Pipes Knock

    Boiler pipes can produce a range of unpleasant noises from gurgling sounds caused by trapped air in the central heating system to...

  • Why Do Baseboard Heaters Make Noise?

    Baseboard heaters are a common feature in many homes, apartments and office buildings. The heaters are installed along the base of the...

  • Why Is My Boiler Banging?

    Whether you've lived in your home for a while now or you're a new homeowner, a banging boiler can be disconcerting. Although...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!