Frozen Heating Pipes and Baseboard
Last updated Reviewed by Waseem Shahzad, Lead Technician
When the heat stops on a frigid night, baseboard and heating pipes along outside walls and in crawlspaces are the first to freeze. A frozen loop stops heat to that zone, and a split pipe can flood when it thaws. Act quickly, thaw gently, and call (631) 414-7141. K2 answers 24/7 from Deer Park.
Call 24/7: (631) 414-7141Smell gas or hear a carbon monoxide alarm? Leave the house first, then call 911 or the gas utility from outside.
How do you know a heating pipe is frozen?
One zone or baseboard stays cold while the boiler runs, the circulator hums with no heat reaching a room, or a section of pipe in a cold spot feels icy. If the whole system stopped overnight in freezing weather, assume pipes on outside walls are at risk even before you see a symptom.
Check the coldest places first: baseboards on outside walls, rooms over a garage or crawlspace, kick-space heaters near doors and pipes in unheated additions. Our post on keeping heating pipes from freezing explains where the risk sits.
What should you do right now?
Get the heat running if you can, and keep the boiler on. Warm the cold room with a space heater kept well away from anything that can burn, open doors and cabinets so warm air reaches pipes, and gently warm an exposed section with a hair dryer. Never use an open flame.
- Keep the boiler on so warm water reaches the loop once it thaws.
- Warm the space, not just the pipe; open the room, closet or cabinet.
- Gentle heat only: a hair dryer or warm towels, never a torch or flame.
- Watch for drips as it thaws; a split may show only then.
When should you stop and call right away?
Call right away if water appears as the pipe thaws, the pressure gauge drops, a baseboard or pipe looks split or bulged, the boiler will not run, or you cannot reach or warm the frozen section. Shut the boiler off if water is reaching the burner or wiring.
If the boiler itself stopped, see no heat, gas boiler repair or oil boiler repair. For leaks, see boiler leaking water.
What does K2 do on a frozen pipe call?
We get the boiler running safely, find the frozen section, thaw it with controlled heat, and check for splits as it warms. We repair split pipe or baseboard, refill and bleed the system, and recommend what will keep that section from freezing again, such as rerouting, insulation or sealing drafts.
Frozen lines aren't only a boiler problem. In Greenlawn in January 2024, a furnace's outside condensate drain line froze and its drain pump leaked; the fix was a new drain line. See high-efficiency furnaces shutting off in the cold and boiler repair.
Questions people ask
How long does it take a heating pipe to freeze?
It depends on the cold, wind and insulation, but pipes on outside walls and in crawlspaces can freeze within hours on a very cold night once water stops moving. That is why keeping the boiler running matters most.
Can I use a space heater to thaw pipes?
Yes, to warm the room, if it is kept away from curtains, bedding and anything that can burn, and never left running unattended. Do not point a flame or a torch at a pipe.
Will my homeowners insurance cover a burst heating pipe?
That depends on your policy and its terms, so check with your insurer. Take photos of the damage and keep the repair invoice. We can give you a written description of what failed and what we repaired.
Need help now?
K2 answers 24/7 for homes within 15 miles of our shop at 60 S 2nd St, Unit V, Deer Park. You get a time window and the price before any repair.
Call 24/7: (631) 414-7141