When a homeowner calls us saying "my pipes are frozen," my first question is always: which pipes? I know that sounds frustrating when you're standing in a cold house, but it matters. The symptoms might seem similar (no water, no heat, or both) but the causes, risks, and solutions are quite different.
I get this call at least a dozen times every winter, and about half the time, the homeowner has misidentified what's actually frozen. That's understandable. This distinction is especially important for rural homes in the Interlake region, where winter heating challenges often involve multiple systems working together or failing together.
Understanding the Two Types of "Pipes"
Water Supply Lines
Water supply lines bring fresh water into your home from either a municipal connection or a private well. They're typically made of copper, PEX, or (in older homes) galvanized steel. These pipes are under pressure from your water source and carry cold water to fixtures throughout your home.
When they freeze: The water inside expands as it turns to ice, potentially cracking the pipe. When the ice thaws, you get water damage, sometimes severe. The Canada Mortgage and Housing Corporation (CMHC) recommends insulating all water supply pipes in unheated areas to prevent freeze damage.
Hydronic Heating Lines
Hydronic heating lines are part of a closed-loop heating system. Hot water (or a water/glycol mixture) circulates from your boiler through these lines to radiators, baseboard heaters, or in-floor heating systems. They're typically PEX tubing, copper, or specialized heating system piping.
When they freeze: The heating system stops working because water can't circulate. Damage risk depends on whether the system uses antifreeze. A lot of rural systems should have glycol in them, but I've seen plenty that don't because someone topped up with plain water over the years.
How to Tell Which System Is Frozen
Signs of Frozen Water Supply Lines
- No water comes from faucets (or very weak flow)
- Toilets don't refill after flushing
- Only some fixtures are affected (the frozen section is between working and non-working fixtures)
- Frost visible on exposed pipes
- Heating system may still be working normally
Signs of Frozen Heating Lines
- Heat stops working in part or all of the house
- Boiler error codes related to circulation or pressure
- Radiators or baseboards are cold even though boiler is running
- Boiler cycles on and off rapidly
- Water supply to sinks and fixtures still works fine
Quick Comparison: Frozen Water Pipes vs Frozen Heating Lines
Signs Both Systems May Be Frozen
In older rural homes with poor insulation, it's possible for both systems to freeze simultaneously, especially in crawlspaces, additions, or areas where pipes run through exterior walls. If you have no water AND no heat, both systems may be affected. This often happens when a furnace fails during a cold snap and the home cools rapidly.
Why Rural Crawlspaces Are High Risk
Many older homes in the Stonewall, Teulon, and RM of Rockwood areas have crawlspace foundations. These spaces are particularly vulnerable because:
- Limited insulation: Original construction often didn't prioritize freeze protection
- Vented foundations: Some crawlspaces have foundation vents that allow cold air in
- Multiple systems: Both water supply and heating lines often run through the same space
- Difficult access: Problems in crawlspaces are harder to spot and fix
Important Warning
Never attempt to thaw frozen pipes with an open flame, propane torch, or heat gun. The risk of fire and pipe damage is too high. If you can't safely thaw pipes with a hair dryer or space heater, call for professional help.
What NOT to Thaw Yourself
While some frozen pipe situations can be safely addressed by homeowners, others require professional help:
You Can Often Handle:
- Exposed, accessible pipes you can see and reach
- Pipes in heated areas that are just temporarily frozen
- Situations where you can apply gentle heat safely
Call a Professional For:
- Pipes inside walls or underground
- Any pipe connected to your heating system (boiler, in-floor heating)
- Situations where you suspect the pipe has already burst (the Insurance Bureau of Canada notes that water damage from burst pipes is one of the most common home insurance claims)
- Gas lines or pipes near gas equipment
- Any situation you're not 100% confident about
Not sure if your frozen pipe situation qualifies as an emergency? Our guide on what counts as an HVAC emergency can help you decide whether to call immediately or wait until business hours.
The Antifreeze Question
Hydronic heating systems in freeze-prone areas should typically include glycol (antifreeze) in the water mixture. However, not all systems do. I've tested glycol levels in boiler systems that were supposed to be protected and found almost no antifreeze left. It happens more often than you'd think, especially in older installations or systems that have been topped up with plain water over the years.
If your boiler or hydronic heating system is in an area that could freeze (unheated space, crawlspace, poorly insulated room), ask us about whether your glycol levels are adequate.
Dealing with Frozen Pipes?
Whether it's frozen water supply lines or heating system issues, our team provides emergency plumbing services throughout the Interlake region.
Get Emergency HelpPreventing Frozen Pipes and Lines
For Water Supply Lines:
- Insulate pipes in crawlspaces, attics, and exterior walls
- Keep garage doors closed if water lines run through the garage
- Open cabinet doors under sinks on exterior walls during extreme cold
- Let faucets drip during severe cold (running water resists freezing)
- Maintain consistent thermostat setting and don't drop heat at night during cold snaps. Check Environment and Climate Change Canada for weather alerts and extreme cold warnings in your area
Prevention is especially critical if you're already noticing signs your home is losing heat. Areas with poor heating are the first places pipes will freeze. And don't forget about your sewer lines — frozen drain pipes are a separate but related problem. Read our guide on frozen sewer lines in Manitoba to understand the risks and prevention strategies for your waste lines.
For Heating Lines:
- Ensure heating system has adequate antifreeze if lines run through cold areas
- Keep boiler running even if you're away and never shut down completely in winter
- Consider adding heat tape or pipe insulation to vulnerable sections
- Have your heating system inspected annually to catch potential freeze risks
The Connection to Heating System Failures
Frozen heating lines are often just one symptom of broader winter heating challenges. If you're dealing with frozen hydronic lines, there may also be issues with your furnace or boiler worth investigating. See our guide: Why Furnaces Fail During Manitoba Cold Snaps.
For a comprehensive overview of rural heating challenges, including frozen lines and other winter issues: Winter Heating Problems in Rural Manitoba Homes.
Frequently Asked Questions
How can I tell if my water pipes or heating lines are frozen?
Check your symptoms: if you have no water at faucets but heat is working, it's water supply pipes. If you have water but cold radiators or floors, it's heating lines. If both are affected, your heating failure may have caused water pipes to freeze. The distinction matters because different trades handle each system.
Which frozen pipes are more dangerous?
Frozen water supply pipes carry higher burst risk because they're under constant pressure from your well or municipal supply. When ice expands, it can rupture the pipe, causing flooding when it thaws. Heating lines are lower pressure and less likely to burst, though they can still crack if frozen solid.
Should I try to thaw frozen pipes myself?
For accessible water pipes, you can use a hair dryer or heat lamp, working from the faucet toward the frozen section. Never use open flames. For heating lines or pipes inside walls, call a professional since improper thawing can cause bursts and water damage. Be ready to shut off water if a pipe has already cracked.
Who do I call for frozen pipes - a plumber or HVAC technician?
For frozen water supply pipes, call a plumber. For frozen hydronic heating lines, call an HVAC technician who works on boilers and radiant systems. Patterson Mechanical handles both plumbing and heating, so one call covers either situation.