What Should I Do If My Boiler Pipes Freeze?

When we think of freezing pipes, we typically think of our faucets. However, when winter weather sets in and temperatures drop below freezing, all the pipes in our homes are susceptible to freezing and bursting.

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If you want to ensure your home and family stay warm, it’s important to know what to do when your boiler pipes freeze.

Why Can Boiler Pipes Freeze?

Can gas boiler pipes freeze? The short answer is yes. Boiler pipes run from the back of the boiler and down an external wall into a drain. Because these pipes are exposed to the weather and carry wastewater, the water inside can freeze. Other reasons you may experience a frozen condensate pipe include:

• Poor insulation. Problems with a boiler condensate pipe freezing may be due to poor or inadequate insulation.

• Lengthy pipe runs. Pipes that run a long distance outside your home have a bigger chance of freezing because the water inside is exposed for extended periods.

• Narrow pipes. Small pipes restrict water flow and take longer for water to drain, increasing the risk of freezing.

What Happens if Boiler Pipes Freeze?

The most common consequence when boiler pipes freeze is lack of heat. Frozen pipes block the flow of wastewater, which causes your boiler to shut down. Over time, pressure can build up inside the boiler, causing damage to internal components. In addition, ice inside the pipes can expand and cause cracks and damage. Once the pipes thaw, this can cause leaks.

How Long Does It Take Boiler Pipes to Freeze?

So, what is the boiler pipes’ freeze time? The time it takes depends on several factors. The colder it is outside, the faster the pipes will freeze. Also, if the water inside the pipes is moving, it may take longer for it to freeze as opposed to standing water. Finally, pipes with adequate insulation can withstand lower temperatures than those without. When it’s 20 degrees Fahrenheit outside, boiler pipes take approximately 4 to 6 hours to freeze.

What Temperature Does Your Boiler Need to Be so Pipes Don't Freeze?

To prevent boiler pipes from freezing, you’ll want to maintain a consistent temperature inside your home and your boiler. Experts recommend leaving your boiler running and setting the thermostat no lower than 55 degrees. There are a few other steps you can take to keep the water in your boiler pipes running freely:

• Add insulation. Check your insulation and make sure all external pipes are fully insulated. Install new insulation or contact an experienced plumber to inspect the system and make the necessary changes.

• Seal gaps. Apply caulk around pipes along interior and exterior walls. This helps prevent heat loss and keeps the pipes warm on the inside.

• Adjust the temperature. If you usually set your boiler at a lower temperature, consider turning it up a few degrees. This keeps the water inside the pipe hot, so it's less likely to freeze.

• Relocate the pipe. If your pipe continues to freeze after taking additional measures, relocate the condensate pipe to a location inside your home. A plumber can help determine if this is the best option and help you find a spot.

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What Should You Do if Your Boiler Pipes Freeze?

When your boiler pipes freeze, there are a few things you can try before calling a plumber.

• Turn off the boiler. Turn the boiler off to prevent further damage.

• Locate the frozen pipe. The condensate pipe is usually a plastic pipe on the outside of your home running from the boiler to a nearby drain.

• Use warm water. Pour hot water over the frozen pipe to thaw the water quickly.

• Apply a hot water bottle. Fill a hot water bottle with hot water and apply it directly to the frozen pipe to unfreeze it.

• Use a hairdryer. Try blowing hot air from a hairdryer over the frozen section of the pipe until water starts flowing again.

• Restart the boiler. Once the pipe has thawed, restart the boiler. You may have to reset the boiler if it kicked off due to a safety feature. Check your manufacturer’s instructions.

• Check the pipe for leaks. Once water is flowing, check for leaks caused by freezing temperatures. Contact a plumber immediately if you see any damage.