Emergency Plumbing → Frozen Pipes
A frozen pipe is not the emergency. The pressure building behind the ice is, and the leak usually appears at the moment everything starts working again.
Plumbing frozen pipes split from pressure, not from ice contact. As an ice plug grows, the water trapped between it and a closed tap has nowhere to go, and the pipe fails at its weakest point, usually somewhere between the plug and the faucet.
That single mechanism explains every piece of advice below, including the one instruction the American Red Cross puts first: keep the faucet open.
If a pipe is frozen right now
Red Cross guidance: keep the faucet open while thawing, because water flowing through the pipe helps melt the remaining ice.
Work backward from the open faucet toward the frozen section, so meltwater always has somewhere to escape rather than being trapped.
A hair dryer, a heating pad, listed heat tape, or towels soaked in hot water. Keep the heat moving and keep it away from standing water.
No blowtorch, no propane heater, no charcoal. Open flame in a wall or crawlspace is how a frozen pipe becomes a house fire.
Should I leave the tap open while thawing a frozen pipe?
Yes. American Red Cross guidance is to keep the faucet open, because as the frozen area melts, water flowing through the pipe helps melt the rest of the ice. An open tap also gives the trapped pressure somewhere to go, which is what removes the risk of a split.
It doubles as your progress indicator. A trickle that becomes a dribble and then a steady stream tells you the plug is clearing without opening a single wall.
Never use an open flame on a frozen pipe
No blowtorch, no propane heater, no charcoal or kerosene appliance indoors. Copper conducts heat straight into whatever it passes through, and a torch in a joist bay or a wall cavity ignites dust, insulation and framing quickly. Every safe method on this page is low-temperature and applied over a broad area.
There is no clock for plumbing frozen pipes, and any page that gives you one is guessing. Duration is not the variable; the closed-tap condition is.
A line can sit frozen for days without failing when the pressure has an escape, and it can split within an hour when the plug grows against a closed faucet. That is why the forums fill with people whose pipes were frozen for a week with no damage, alongside people who lost a ceiling overnight.
Practically: open the tap, and the question stops mattering.
This is the case the ranking guides skip and the forums keep asking about. You cannot put a hair dryer on a pipe you cannot see.
This is where calling a plumber genuinely earns the fee. Thawing machines that pass low-voltage current along the pipe clear a concealed plug in minutes, and locating that plug is a skill rather than a guess.
Ice seals the split it created. For as long as the pipe stays frozen, a burst pipe often shows no water at all, which is why the relief of returning flow is so frequently followed by the sound of water in a ceiling.
Be at the main shut-off valve when flow returns. Have someone else watch the run if you can, and check every joint, every ceiling below the affected line, and inside any cabinet the pipe passes through.
If water does appear, the sequence in what to do the moment a pipe bursts takes over, starting with closing that valve you are already standing next to.
Know the line
What temperature should I keep the house at to stop pipes freezing?
The American Red Cross advises keeping the heat set no lower than 55F when you go away in cold weather, holding the thermostat at the same temperature day and night, letting cold water drip from faucets served by exposed pipes, and opening kitchen and bathroom cabinet doors.
The constant-temperature point is the one people skip to save money. A nightly setback of a few degrees is exactly the window in which an exterior-wall run freezes, and the saving is trivial against a burst.
The dripping tap works for the reason set out at the top of this page. A tap that is open cannot build pressure behind an ice plug, which is the mechanism that splits pipes.
What homeowners actually ask
Drawn from real public forum threads and reported prices, summarised and attributed as patterns. These are not reviews of this site, and no names or ratings have been invented.
“Help! I am home alone and pipes are frozen and I do not know what to do!”
“Is there a way to thaw a frozen pipe, if you cannot access the pipe?”
“If pipe has been frozen for a week, should I call a plumber?”
“If your pipes are frozen there is probably nothing a plumber can do”
1 / 4
The first-ranking thread for this search says a plumber probably cannot help with plumbing frozen pipes. That is overstated, but it reflects something real about how freeze nights work.
What they can do: locate a concealed plug quickly, thaw it with equipment no homeowner owns, and repair a split once it appears. What they cannot do is arrive quickly when every line in the region has frozen at once.
Queues on those nights are triaged by active leaks, because a leaking pipe is doing damage and a frozen one is not yet. A frozen but intact pipe is genuinely lower priority, which is worth knowing before you spend an evening waiting rather than thawing.
Indicative US ranges. Always get a written quote.
| Job | Typical range | Notes |
|---|---|---|
| Emergency trip fee | $75–$500 | Charged to attend, freeze nights included |
| Labor, standard hours | $100–$200 / hr | Thawing and locating the plug |
| Labor, after hours | up to $350 / hr | 1.5×–2×, and freeze nights are peak demand |
| Burst repair, accessible run | $150–$2,000 | Reported average near $500 |
| Burst repair, under slab | $500–$4,000+ | Access work dominates the bill |
| Water damage cleanup if it let go | $1,000–$2,000+ | Separate restoration trade |
Freeze nights are peak demand, which puts the after-hours multiplier at the top of its range. If you have thawed the pipe and nothing is leaking, the first slot the following morning is materially cheaper and carries no extra risk. Full rate detail is in our breakdown of what an emergency plumber charges.
Emergency Services 24H is a referral service. We do not employ plumbers and we do not perform thawing or repair work.
Your request routes by ZIP code to licensed, insured contractors covering your area, and they contact you directly. On a regional freeze, be honest on the phone about whether the pipe is leaking, because that is what decides where you sit in the queue.
24/7 dispatch network
A concealed frozen section, a pipe that has already split, or a property you cannot get heat into. Send the details and your ZIP code and licensed, insured plumbers covering your area will contact you directly. No obligation.
Fire, a gas smell, or an injury? Leave the building and call 911 first, then your gas utility or power company. Use this form once you are safe.
Straight answers
The questions homeowners actually search for on this problem, answered in plain language.
Browse all guidesYes, once the surrounding temperature rises, but that is the moment the problem shows itself. If the ice split the pipe, the ice is also what has been sealing the split, so the leak starts as it melts. Be at the main shut-off valve when flow returns rather than discovering it hours later.
Controlled electric heat: thawing machines that pass low-voltage current through the pipe, heat blankets, and industrial heat guns used at a distance. What they do not use is an open flame, because that scorches framing and can ignite a wall cavity. Their real advantage is locating the plug quickly.
There is no reliable clock, because it is pressure rather than time that splits a pipe. A line can sit frozen for days without failing if the pressure has somewhere to go, and can split within an hour if the ice plug grows against a closed tap. Keeping a faucet open is what removes the risk.
When a tap slows to a trickle in cold weather, which usually means an ice plug has already formed upstream. Sustained sub-freezing temperatures, unheated crawlspaces, garages and exterior-wall runs are the classic setup, and the American Red Cross advises keeping heat no lower than 55F when a property is left empty.
Yes, and it is the standard homeowner method. Open the faucet first, then work the heat along the pipe starting at the tap end and moving toward the frozen section, so meltwater has somewhere to escape. Keep it away from standing water, and never substitute a blowtorch or a propane heater.
For a frozen drain line rather than a supply line, hot water poured slowly can help, and rock salt in hot water can help a frozen trap. Do not use boiling water on a frozen supply pipe, because the thermal shock can crack it. Supply lines get external heat, not internal.
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24/7 dispatch network
Tell us what has failed and where you are. We route your request to licensed, insured contractors covering your ZIP code, and they contact you directly.
Fire, a gas smell, or an injury? Leave the building and call 911 first, then your gas utility or power company. Use this form once you are safe.