A well pump freezes when the water inside the exposed parts turns to ice, blocking flow and potentially cracking pipes or the pump housing itself

The danger is real but manageable. Well pumps sit above ground or in shallow pits, and the water inside them doesn't move in winter the way it does during the heating season. When outdoor temperatures drop below freezing for extended periods, that standing water turns to ice. Once it does, you lose water pressure to your house, and the expanding ice can split pipes, crack the pump casing, or damage the check valve.

The good news: most freezing happens to pumps that lack basic winter protection, and you can prevent it with steps you can take yourself or with a plumber's help. Your options range from cheap passive insulation to active heating systems, and the right choice depends on how cold your winters get and how long they last.

Key Takeaways

  • Insulate the pump housing and the first 10 feet of discharge pipe with foam pipe wrap or fiberglass insulation, which costs $20 to $60 and takes an afternoon to install.
  • A heat tape wrapped around the pump and pipes and plugged into a thermostat-controlled outlet will turn on automatically when temperature drops, but adds $100 to $200 to your electric bill over winter.
  • Drain the pump and all exposed pipes before the first hard freeze if you live in a climate where temperatures stay below 32°F for weeks at a time.
  • Keep the pump pit or enclosure sealed and insulated with a cover or blanket to trap ground heat and block wind.
  • If your pump freezes, do not explore direct heat with a torch or space heater — call a plumber, because thawing ice inside the pump can cause hidden damage.

Insulation is the first and cheapest defense

Wrapping the pump and pipes in insulation slows heat loss and keeps the water inside from reaching freezing temperature as quickly. The most common material is foam pipe wrap, which comes in sleeves you slide over pipes or wrap around the pump housing. You can buy it at any hardware store for $0.50 to $1.50 per foot. For a typical pump and 10 feet of discharge pipe, you'll spend $20 to $40 and spend an hour or two installing it.

Start at the pump itself. Wrap the housing, the motor, and the check valve (the part where the discharge pipe leaves the pump). Then follow the discharge pipe — the one carrying water to your house — for at least the first 10 feet or until it enters the ground or a building. Overlap the wrap as you go so no bare pipe shows. Seal seams with duct tape or the adhesive tape that comes with some foam wrap.

If you have a submersible pump in a well casing, insulation is less critical because the ground around the casing stays warmer, but you should still insulate the pressure tank and any exposed pipe above ground. Foam wrap is permanent once installed, so you don't have to remember to turn it on or worry about electricity costs — it works year after year with no maintenance.

Heat tape provides active protection in extreme cold

Heat tape is an electric heating cable that wraps around the pump and pipes and plugs into an outlet. The best kind has a thermostat built in, so it turns on automatically when the temperature drops to around 35°F and turns off when it rises. This means you don't have to remember to plug it in or worry about it running all winter and spiking your electric bill.

Installation is straightforward: wrap the tape around the pump housing and along the discharge pipe, spacing the wraps about 2 inches apart so the heat distributes evenly. Plug it into a GFCI-protected outlet (the kind with a test button) near the pump. A thermostat-controlled heat tape costs $80 to $150, and running it through a cold winter typically adds $100 to $200 to your electric bill, depending on how cold it gets and how long freezing temperatures last.

Use heat tape only if you live somewhere that gets sustained freezing — below 32°F for weeks or months — because it's not worth the cost for occasional cold snaps. Many homeowners combine heat tape with insulation, so the insulation does most of the work and the heat tape kicks in only during the coldest periods.

Draining the system works in climates with long, hard freezes

If you live in a region where temperatures stay below freezing for extended periods, you may want to drain the pump and all exposed pipes before winter arrives. This removes the water that would freeze. You'll lose water pressure to your house, so this approach works only if you have an alternative water source (a municipal connection, a backup well, or stored water) or if you're willing to be without running water for the winter.

To drain the system, shut off the pump, open the lowest drain valve on the discharge pipe, and let water flow out until the pipe is empty. Open a faucet in the house to break the vacuum and speed drainage. Once the pipe is dry, leave the drain valve open so any water that seeps back in can escape instead of freezing. Some people also drain the pump housing itself by removing a plug or valve — check your pump's manual for the location.

This is a job a plumber can do in an hour or two if you're not comfortable doing it yourself. The advantage is that once the system is drained, you have no freezing risk at all. The disadvantage is that you're without water until spring, unless you have a backup source. In very cold climates where winters last four to six months, draining is often the most reliable and cost-effective option.

Seal and insulate the pump pit or enclosure

If your pump sits in a pit or a small concrete box, that enclosure can trap ground heat and protect the pump from wind. Make sure the cover fits snugly and seals out rain and snow. If the pit is open or the cover has gaps, cold air circulates around the pump and defeats the purpose of the insulation.

You can improve an existing pit by adding a blanket or foam board under the cover. Lay rigid foam insulation (the pink or blue kind) on top of the pit before closing the cover, or drape an old blanket over the pump housing before closing the cover. Do not use materials that trap moisture — wet insulation loses its insulating value and can promote rust. may support the cover still allows air to flow so the pump doesn't overheat in summer, and never seal the pit completely in a way that traps exhaust gases from the motor.

What to do if the pump freezes anyway

If you turn on a faucet and nothing comes out, and you know it's been well below freezing, the pump may be frozen. Do not try to thaw it yourself with a torch, space heater, or boiling water. Direct heat can crack the pump casing or damage internal seals, and you may not see the damage until the pump fails weeks later.

Instead, call a plumber. They have experience thawing pumps safely, usually by explore gentle, controlled heat or by using a heat gun on a low setting. They can also inspect the pump afterward to make sure no hidden damage occurred. If the pump is old or has frozen before, this may be a good time to replace it with a newer model that's more resistant to cold or to upgrade your insulation and heating system so it doesn't happen again.

Choosing between insulation, heat tape, and draining

The right approach depends on where you live and how severe your winters are. In mild climates where freezing is rare and brief, foam pipe wrap alone is usually enough — it's cheap, permanent, and requires no electricity. In moderate climates with occasional hard freezes, combine insulation with a thermostat-controlled heat tape so you have a backup. In extreme climates with long, sustained freezing, draining the system before winter may be the most reliable option, especially if you have an alternative water source.

You can also combine methods. Many homeowners insulate the pump and pipes, install heat tape as a backup, and keep the pit sealed and covered. This layered approach costs $150 to $300 upfront but gives you confidence that your pump will keep working all winter. A plumber can assess your specific setup and recommend the best combination for your climate and budget.

Frequently Asked Questions

How cold does it have to be for a well pump to freeze?

Water freezes at 32°F, but a well pump usually doesn't freeze until temperatures drop to 20°F or lower and stay there for several days or longer. Insulation and ground heat slow the process, so an unprotected pump in a pit might freeze at 15°F, while an insulated pump may survive 0°F. The duration matters as much as the temperature — a single night at 25°F rarely causes freezing, but a week of nights at 20°F almost certainly will.

Can I use regular blankets or tarps to insulate my pump?

Tarps and blankets trap moisture, which reduces their insulating value and can cause rust on metal parts. Use foam pipe wrap, fiberglass pipe insulation, or rigid foam board instead. These materials shed water and maintain their insulating properties when wet. You can drape a tarp over the insulation to shed rain and snow, but keep the insulation itself dry.

Will heat tape increase my electric bill a lot?

A thermostat-controlled heat tape typically adds $100 to $200 to your winter electric bill, depending on how cold it gets and how long freezing temperatures last. If you live in a mild climate where freezing is rare, the cost may not be worth it. If you live somewhere that freezes for months, the cost of replacing a frozen pump ($500 to $2,000) is much higher than the cost of running heat tape.

What if my pump is inside the house or in a heated basement?

If the pump itself is indoors, freezing is not a concern for the pump. However, the discharge pipe may still freeze where it exits the house or runs through an unheated space. Insulate any exposed pipe outside the house or in an unheated garage or crawlspace. The pressure tank and check valve, if they're in an unheated area, should also be wrapped.

Should I leave the pump running all winter to prevent freezing?

Running the pump continuously does keep water moving and reduces freezing risk, but it wastes electricity and wears out the pump faster. A better approach is to insulate the pump and use a thermostat-controlled heat tape that turns on only when needed. If you do run the pump continuously, make sure it's designed for that duty and that you have a pressure tank to prevent the pump from cycling on and off constantly.